diff --git a/Makefile.am b/Makefile.am
index 3546ae7d6..3628af116 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -93,3 +93,5 @@ clean-local:
 distclean-local:
 	rm -f include/_stdint.h
 	rm -f include/byteorder.h
+
+ACLOCAL_AMFLAGS = -I m4