diff --git a/bpf/Makefile.am b/bpf/Makefile.am
index 7aafb694..9017fd95 100644
--- a/bpf/Makefile.am
+++ b/bpf/Makefile.am
@@ -21,9 +21,9 @@
 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-if HAVE_LIBBPF
+EXTRA_DIST = CMakeLists.txt reuseport_kern.c
 
-EXTRA_DIST = reuseport_kern.c
+if HAVE_LIBBPF
 
 bpf_pkglibdir = $(pkglibdir)
 bpf_pkglib_DATA = reuseport_kern.o
diff --git a/third-party/Makefile.am b/third-party/Makefile.am
index 55fdad0c..2d6726d8 100644
--- a/third-party/Makefile.am
+++ b/third-party/Makefile.am
@@ -23,7 +23,7 @@
 
 AM_CPPFLAGS = @DEFS@
 
-EXTRA_DIST = CMakeLists.txt
+EXTRA_DIST = CMakeLists.txt build_config.rb mruby/*
 
 if ENABLE_THIRD_PARTY
 
@@ -49,8 +49,6 @@ endif # HAVE_NEVERBLEED
 
 if HAVE_MRUBY
 
-EXTRA_DIST += build_config.rb mruby/*
-
 .PHONY: all-local clean mruby
 
 mruby: