diff --git a/src/shrpx-unittest.cc b/src/shrpx-unittest.cc
index 3e757bd5..d814296e 100644
--- a/src/shrpx-unittest.cc
+++ b/src/shrpx-unittest.cc
@@ -22,6 +22,10 @@
  * 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 <stdio.h>
 #include <string.h>
 #include <CUnit/Basic.h>
diff --git a/tests/main.c b/tests/main.c
index 02a8895f..4338ec04 100644
--- a/tests/main.c
+++ b/tests/main.c
@@ -22,6 +22,10 @@
  * 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 <stdio.h>
 #include <string.h>
 #include <CUnit/Basic.h>