diff --git a/CMakeLists.txt b/CMakeLists.txt
index cdd38335..85b62980 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -447,7 +447,7 @@ if(NOT ENABLE_THREADS OR NOT HAVE_STD_FUTURE)
 endif()
 
 add_definitions(-DHAVE_CONFIG_H)
-configure_file(cmakeconfig.h.in config.h)
+configure_file(cmakeconfig.h.in nghttp2_config.h)
 # autotools-compatible names
 # Sphinx expects relative paths in the .rst files. Use the fact that the files
 # below are all one directory level deep.
@@ -497,7 +497,7 @@ if(APPLE)
 endif()
 
 include_directories(
-  "${CMAKE_CURRENT_BINARY_DIR}" # for config.h
+  "${CMAKE_CURRENT_BINARY_DIR}" # for nghttp2_config.h
 )
 # For use in src/CMakeLists.txt
 set(PKGDATADIR "${CMAKE_INSTALL_FULL_DATADIR}/${CMAKE_PROJECT_NAME}")
diff --git a/lib/nghttp2_buf.h b/lib/nghttp2_buf.h
index 45f62f16..5224e037 100644
--- a/lib/nghttp2_buf.h
+++ b/lib/nghttp2_buf.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_BUF_H
 #define NGHTTP2_BUF_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_callbacks.h b/lib/nghttp2_callbacks.h
index 61e51fa5..e25e7ff3 100644
--- a/lib/nghttp2_callbacks.h
+++ b/lib/nghttp2_callbacks.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_CALLBACKS_H
 #define NGHTTP2_CALLBACKS_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_debug.h b/lib/nghttp2_debug.h
index cbb4dd57..5e23868e 100644
--- a/lib/nghttp2_debug.h
+++ b/lib/nghttp2_debug.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_DEBUG_H
 #define NGHTTP2_DEBUG_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_frame.h b/lib/nghttp2_frame.h
index 5f6152b7..d2175e01 100644
--- a/lib/nghttp2_frame.h
+++ b/lib/nghttp2_frame.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_FRAME_H
 #define NGHTTP2_FRAME_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 #include "nghttp2_hd.h"
diff --git a/lib/nghttp2_hd.h b/lib/nghttp2_hd.h
index 6de0052a..bccb69c5 100644
--- a/lib/nghttp2_hd.h
+++ b/lib/nghttp2_hd.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_HD_H
 #define NGHTTP2_HD_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_hd_huffman.h b/lib/nghttp2_hd_huffman.h
index 2bfd5318..95025784 100644
--- a/lib/nghttp2_hd_huffman.h
+++ b/lib/nghttp2_hd_huffman.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_HD_HUFFMAN_H
 #define NGHTTP2_HD_HUFFMAN_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_helper.h b/lib/nghttp2_helper.h
index b1f18ce5..f459283c 100644
--- a/lib/nghttp2_helper.h
+++ b/lib/nghttp2_helper.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_HELPER_H
 #define NGHTTP2_HELPER_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <string.h>
 #include <stddef.h>
diff --git a/lib/nghttp2_http.h b/lib/nghttp2_http.h
index 0c3a78ee..9f863e70 100644
--- a/lib/nghttp2_http.h
+++ b/lib/nghttp2_http.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_HTTP_H
 #define NGHTTP2_HTTP_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 #include "nghttp2_session.h"
diff --git a/lib/nghttp2_int.h b/lib/nghttp2_int.h
index b23585cc..caa917a1 100644
--- a/lib/nghttp2_int.h
+++ b/lib/nghttp2_int.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_INT_H
 #define NGHTTP2_INT_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_map.h b/lib/nghttp2_map.h
index 1419a09a..b649ace5 100644
--- a/lib/nghttp2_map.h
+++ b/lib/nghttp2_map.h
@@ -26,9 +26,7 @@
 #ifndef NGHTTP2_MAP_H
 #define NGHTTP2_MAP_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_mem.h b/lib/nghttp2_mem.h
index f83dbcb8..a32ae756 100644
--- a/lib/nghttp2_mem.h
+++ b/lib/nghttp2_mem.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_MEM_H
 #define NGHTTP2_MEM_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_net.h b/lib/nghttp2_net.h
index 521f9814..119dfb02 100644
--- a/lib/nghttp2_net.h
+++ b/lib/nghttp2_net.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_NET_H
 #define NGHTTP2_NET_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #ifdef HAVE_ARPA_INET_H
 #  include <arpa/inet.h>
diff --git a/lib/nghttp2_npn.h b/lib/nghttp2_npn.h
index c6f1c04b..7f84f17b 100644
--- a/lib/nghttp2_npn.h
+++ b/lib/nghttp2_npn.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_NPN_H
 #define NGHTTP2_NPN_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_option.h b/lib/nghttp2_option.h
index b228a075..a1304e16 100644
--- a/lib/nghttp2_option.h
+++ b/lib/nghttp2_option.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_OPTION_H
 #define NGHTTP2_OPTION_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_outbound_item.h b/lib/nghttp2_outbound_item.h
index bd4611b5..3a29572f 100644
--- a/lib/nghttp2_outbound_item.h
+++ b/lib/nghttp2_outbound_item.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_OUTBOUND_ITEM_H
 #define NGHTTP2_OUTBOUND_ITEM_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 #include "nghttp2_frame.h"
diff --git a/lib/nghttp2_pq.h b/lib/nghttp2_pq.h
index c8d90ef2..25e301ef 100644
--- a/lib/nghttp2_pq.h
+++ b/lib/nghttp2_pq.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_PQ_H
 #define NGHTTP2_PQ_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 #include "nghttp2_int.h"
diff --git a/lib/nghttp2_priority_spec.h b/lib/nghttp2_priority_spec.h
index 92ece822..9416781d 100644
--- a/lib/nghttp2_priority_spec.h
+++ b/lib/nghttp2_priority_spec.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_PRIORITY_SPEC_H
 #define NGHTTP2_PRIORITY_SPEC_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_queue.h b/lib/nghttp2_queue.h
index a06fa6c7..2e2f539d 100644
--- a/lib/nghttp2_queue.h
+++ b/lib/nghttp2_queue.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_QUEUE_H
 #define NGHTTP2_QUEUE_H
 
-#ifdef HAVE_CONFIG_H
-#  include "config.h"
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_rcbuf.h b/lib/nghttp2_rcbuf.h
index 6814e709..1e82d9f3 100644
--- a/lib/nghttp2_rcbuf.h
+++ b/lib/nghttp2_rcbuf.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_RCBUF_H
 #define NGHTTP2_RCBUF_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_session.h b/lib/nghttp2_session.h
index 34d2d585..ae644adf 100644
--- a/lib/nghttp2_session.h
+++ b/lib/nghttp2_session.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_SESSION_H
 #define NGHTTP2_SESSION_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 #include "nghttp2_map.h"
diff --git a/lib/nghttp2_stream.h b/lib/nghttp2_stream.h
index 7a8e4c6c..457becdd 100644
--- a/lib/nghttp2_stream.h
+++ b/lib/nghttp2_stream.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_STREAM_H
 #define NGHTTP2_STREAM_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 #include "nghttp2_outbound_item.h"
diff --git a/lib/nghttp2_submit.h b/lib/nghttp2_submit.h
index 74d702fb..4008517c 100644
--- a/lib/nghttp2_submit.h
+++ b/lib/nghttp2_submit.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_SUBMIT_H
 #define NGHTTP2_SUBMIT_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/lib/nghttp2_version.c b/lib/nghttp2_version.c
index 4211f2cf..d67540b0 100644
--- a/lib/nghttp2_version.c
+++ b/lib/nghttp2_version.c
@@ -22,9 +22,7 @@
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <nghttp2/nghttp2.h>
 
diff --git a/src/base64_test.h b/src/base64_test.h
index 8bdb84f8..a7485ee8 100644
--- a/src/base64_test.h
+++ b/src/base64_test.h
@@ -25,9 +25,7 @@
 #ifndef BASE64_TEST_H
 #define BASE64_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace nghttp2 {
 
diff --git a/src/buffer_test.h b/src/buffer_test.h
index 6789aa39..2d135ab9 100644
--- a/src/buffer_test.h
+++ b/src/buffer_test.h
@@ -25,9 +25,7 @@
 #ifndef BUFFER_TEST_H
 #define BUFFER_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace nghttp2 {
 
diff --git a/src/comp_helper.h b/src/comp_helper.h
index 131ed21b..98130f69 100644
--- a/src/comp_helper.h
+++ b/src/comp_helper.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_COMP_HELPER_H
 #define NGHTTP2_COMP_HELPER_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <jansson.h>
 
diff --git a/src/deflatehd.cc b/src/deflatehd.cc
index 7dcfccff..ef624d17 100644
--- a/src/deflatehd.cc
+++ b/src/deflatehd.cc
@@ -22,9 +22,7 @@
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 #ifdef HAVE_UNISTD_H
 #  include <unistd.h>
diff --git a/src/http2_test.h b/src/http2_test.h
index 0d63020e..4376bde8 100644
--- a/src/http2_test.h
+++ b/src/http2_test.h
@@ -25,9 +25,7 @@
 #ifndef SHRPX_HTTP2_TEST_H
 #define SHRPX_HTTP2_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace shrpx {
 
diff --git a/src/inflatehd.cc b/src/inflatehd.cc
index f484042a..2a98432a 100644
--- a/src/inflatehd.cc
+++ b/src/inflatehd.cc
@@ -22,9 +22,7 @@
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 #ifdef HAVE_UNISTD_H
 #  include <unistd.h>
diff --git a/src/memchunk_test.h b/src/memchunk_test.h
index 7d677e78..21814da3 100644
--- a/src/memchunk_test.h
+++ b/src/memchunk_test.h
@@ -25,9 +25,7 @@
 #ifndef MEMCHUNK_TEST_H
 #define MEMCHUNK_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace nghttp2 {
 
diff --git a/src/network.h b/src/network.h
index 45311d84..079dc542 100644
--- a/src/network.h
+++ b/src/network.h
@@ -25,9 +25,7 @@
 #ifndef NETWORK_H
 #define NETWORK_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 #include <sys/types.h>
 #ifdef HAVE_SYS_SOCKET_H
diff --git a/src/nghttp2_config.h b/src/nghttp2_config.h
index 8e6cd05f..6f058ba6 100644
--- a/src/nghttp2_config.h
+++ b/src/nghttp2_config.h
@@ -26,7 +26,7 @@
 #define NGHTTP2_CONFIG_H
 
 #ifdef HAVE_CONFIG_H
-#  include <config.h>
+#  include "nghttp2_user_config.h"
 #endif // HAVE_CONFIG_H
 
 #endif // NGHTTP2_CONFIG_H
diff --git a/src/nghttp2_gzip.h b/src/nghttp2_gzip.h
index a40352c3..8030b2c2 100644
--- a/src/nghttp2_gzip.h
+++ b/src/nghttp2_gzip.h
@@ -24,9 +24,7 @@
  */
 #ifndef NGHTTP2_GZIP_H
 
-#  ifdef HAVE_CONFIG_H
-#    include <config.h>
-#  endif /* HAVE_CONFIG_H */
+#  include "nghttp2_config.h"
 #  include <zlib.h>
 
 #  include <nghttp2/nghttp2.h>
diff --git a/src/nghttp2_gzip_test.h b/src/nghttp2_gzip_test.h
index 8d554f72..30874e69 100644
--- a/src/nghttp2_gzip_test.h
+++ b/src/nghttp2_gzip_test.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_GZIP_TEST_H
 #define NGHTTP2_GZIP_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/src/shrpx-unittest.cc b/src/shrpx-unittest.cc
index 35108529..43148dca 100644
--- a/src/shrpx-unittest.cc
+++ b/src/shrpx-unittest.cc
@@ -22,9 +22,7 @@
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 #include <stdio.h>
 #include <string.h>
diff --git a/src/shrpx_config_test.h b/src/shrpx_config_test.h
index a30de41a..245e3cd5 100644
--- a/src/shrpx_config_test.h
+++ b/src/shrpx_config_test.h
@@ -25,9 +25,7 @@
 #ifndef SHRPX_CONFIG_TEST_H
 #define SHRPX_CONFIG_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace shrpx {
 
diff --git a/src/shrpx_downstream_test.h b/src/shrpx_downstream_test.h
index ef06ea30..db5a6cc3 100644
--- a/src/shrpx_downstream_test.h
+++ b/src/shrpx_downstream_test.h
@@ -25,9 +25,7 @@
 #ifndef SHRPX_DOWNSTREAM_TEST_H
 #define SHRPX_DOWNSTREAM_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace shrpx {
 
diff --git a/src/shrpx_http_test.h b/src/shrpx_http_test.h
index d50ab533..2bbcbc7b 100644
--- a/src/shrpx_http_test.h
+++ b/src/shrpx_http_test.h
@@ -25,9 +25,7 @@
 #ifndef SHRPX_HTTP_TEST_H
 #define SHRPX_HTTP_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace shrpx {
 
diff --git a/src/shrpx_router_test.h b/src/shrpx_router_test.h
index d39cb87b..452cf622 100644
--- a/src/shrpx_router_test.h
+++ b/src/shrpx_router_test.h
@@ -25,9 +25,7 @@
 #ifndef SHRPX_ROUTER_TEST_H
 #define SHRPX_ROUTER_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace shrpx {
 
diff --git a/src/shrpx_tls_test.h b/src/shrpx_tls_test.h
index e9c69d00..cb5b2f0d 100644
--- a/src/shrpx_tls_test.h
+++ b/src/shrpx_tls_test.h
@@ -25,9 +25,7 @@
 #ifndef SHRPX_TLS_TEST_H
 #define SHRPX_TLS_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace shrpx {
 
diff --git a/src/shrpx_worker_test.h b/src/shrpx_worker_test.h
index 8ffa2f12..b5945016 100644
--- a/src/shrpx_worker_test.h
+++ b/src/shrpx_worker_test.h
@@ -25,9 +25,7 @@
 #ifndef SHRPX_WORKER_TEST_H
 #define SHRPX_WORKER_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace shrpx {
 
diff --git a/src/template_test.h b/src/template_test.h
index 2c1448f3..ba3593fc 100644
--- a/src/template_test.h
+++ b/src/template_test.h
@@ -25,9 +25,7 @@
 #ifndef TEMPLATE_TEST_H
 #define TEMPLATE_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace nghttp2 {
 
diff --git a/src/timegm.h b/src/timegm.h
index 56f9cc6c..f2fadf2d 100644
--- a/src/timegm.h
+++ b/src/timegm.h
@@ -25,9 +25,7 @@
 #ifndef TIMEGM_H
 #define TIMEGM_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/src/util_test.h b/src/util_test.h
index 9c12e9f1..81ec776d 100644
--- a/src/util_test.h
+++ b/src/util_test.h
@@ -25,9 +25,7 @@
 #ifndef UTIL_TEST_H
 #define UTIL_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif // HAVE_CONFIG_H
+#include "nghttp2_config.h"
 
 namespace shrpx {
 
diff --git a/src/xsi_strerror.h b/src/xsi_strerror.h
index 32cadc34..ecec975f 100644
--- a/src/xsi_strerror.h
+++ b/src/xsi_strerror.h
@@ -25,9 +25,7 @@
 #ifndef XSI_STRERROR_H
 #define XSI_STRERROR_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <stddef.h>
 
diff --git a/tests/failmalloc.c b/tests/failmalloc.c
index 6294cfff..ba3c2648 100644
--- a/tests/failmalloc.c
+++ b/tests/failmalloc.c
@@ -22,9 +22,7 @@
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <stdio.h>
 #include <string.h>
diff --git a/tests/failmalloc_test.h b/tests/failmalloc_test.h
index 576932a7..93b5a145 100644
--- a/tests/failmalloc_test.h
+++ b/tests/failmalloc_test.h
@@ -25,9 +25,7 @@
 #ifndef FAILMALLOC_TEST_H
 #define FAILMALLOC_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 void test_nghttp2_session_send(void);
 void test_nghttp2_session_send_server(void);
diff --git a/tests/main.c b/tests/main.c
index 6ff97d05..db264f34 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -22,9 +22,7 @@
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <stdio.h>
 #include <string.h>
diff --git a/tests/malloc_wrapper.h b/tests/malloc_wrapper.h
index a3a3dd79..aafed28d 100644
--- a/tests/malloc_wrapper.h
+++ b/tests/malloc_wrapper.h
@@ -25,9 +25,7 @@
 #ifndef MALLOC_WRAPPER_H
 #define MALLOC_WRAPPER_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include <stdlib.h>
 
diff --git a/tests/nghttp2_buf_test.h b/tests/nghttp2_buf_test.h
index 714b89fd..9bb8939d 100644
--- a/tests/nghttp2_buf_test.h
+++ b/tests/nghttp2_buf_test.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_BUF_TEST_H
 #define NGHTTP2_BUF_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 void test_nghttp2_bufs_add(void);
 void test_nghttp2_bufs_add_stack_buffer_overflow_bug(void);
diff --git a/tests/nghttp2_frame_test.h b/tests/nghttp2_frame_test.h
index dc076257..fb959c40 100644
--- a/tests/nghttp2_frame_test.h
+++ b/tests/nghttp2_frame_test.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_FRAME_TEST_H
 #define NGHTTP2_FRAME_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 void test_nghttp2_frame_pack_headers(void);
 void test_nghttp2_frame_pack_headers_frame_too_large(void);
diff --git a/tests/nghttp2_hd_test.h b/tests/nghttp2_hd_test.h
index ab0117cb..90cb6beb 100644
--- a/tests/nghttp2_hd_test.h
+++ b/tests/nghttp2_hd_test.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_HD_TEST_H
 #define NGHTTP2_HD_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 void test_nghttp2_hd_deflate(void);
 void test_nghttp2_hd_deflate_same_indexed_repr(void);
diff --git a/tests/nghttp2_helper_test.h b/tests/nghttp2_helper_test.h
index 8790dcf6..892e3bac 100644
--- a/tests/nghttp2_helper_test.h
+++ b/tests/nghttp2_helper_test.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_HELPER_TEST_H
 #define NGHTTP2_HELPER_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 void test_nghttp2_adjust_local_window_size(void);
 void test_nghttp2_check_header_name(void);
diff --git a/tests/nghttp2_map_test.h b/tests/nghttp2_map_test.h
index 235624de..b399e7e0 100644
--- a/tests/nghttp2_map_test.h
+++ b/tests/nghttp2_map_test.h
@@ -26,9 +26,7 @@
 #ifndef NGHTTP2_MAP_TEST_H
 #define NGHTTP2_MAP_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 void test_nghttp2_map(void);
 void test_nghttp2_map_functional(void);
diff --git a/tests/nghttp2_npn_test.h b/tests/nghttp2_npn_test.h
index f1c97631..c65609a3 100644
--- a/tests/nghttp2_npn_test.h
+++ b/tests/nghttp2_npn_test.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_NPN_TEST_H
 #define NGHTTP2_NPN_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 void test_nghttp2_npn(void);
 
diff --git a/tests/nghttp2_pq_test.h b/tests/nghttp2_pq_test.h
index 969662a9..76d0b90c 100644
--- a/tests/nghttp2_pq_test.h
+++ b/tests/nghttp2_pq_test.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_PQ_TEST_H
 #define NGHTTP2_PQ_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 void test_nghttp2_pq(void);
 void test_nghttp2_pq_update(void);
diff --git a/tests/nghttp2_queue_test.h b/tests/nghttp2_queue_test.h
index 64f8ce85..b3173071 100644
--- a/tests/nghttp2_queue_test.h
+++ b/tests/nghttp2_queue_test.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_QUEUE_TEST_H
 #define NGHTTP2_QUEUE_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 void test_nghttp2_queue(void);
 
diff --git a/tests/nghttp2_session_test.h b/tests/nghttp2_session_test.h
index e776813f..3086ec4d 100644
--- a/tests/nghttp2_session_test.h
+++ b/tests/nghttp2_session_test.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_SESSION_TEST_H
 #define NGHTTP2_SESSION_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 void test_nghttp2_session_recv(void);
 void test_nghttp2_session_recv_invalid_stream_id(void);
diff --git a/tests/nghttp2_stream_test.h b/tests/nghttp2_stream_test.h
index ad7be640..7f9ceb8f 100644
--- a/tests/nghttp2_stream_test.h
+++ b/tests/nghttp2_stream_test.h
@@ -25,8 +25,6 @@
 #ifndef NGHTTP2_STREAM_TEST_H
 #define NGHTTP2_STREAM_TEST_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #endif /* NGHTTP2_STREAM_TEST_H */
diff --git a/tests/nghttp2_test_helper.h b/tests/nghttp2_test_helper.h
index c66298a0..f9086a9a 100644
--- a/tests/nghttp2_test_helper.h
+++ b/tests/nghttp2_test_helper.h
@@ -25,9 +25,7 @@
 #ifndef NGHTTP2_TEST_HELPER_H
 #define NGHTTP2_TEST_HELPER_H
 
-#ifdef HAVE_CONFIG_H
-#  include <config.h>
-#endif /* HAVE_CONFIG_H */
+#include "nghttp2_config.h"
 
 #include "nghttp2_frame.h"
 #include "nghttp2_hd.h"