diff --git a/Makefile.am b/Makefile.am
index 71c3286..12844d2 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,4 @@
+ACLOCAL_AMFLAGS = -I m4
 
 INCLUDES = -I. -I./include @INOTIFY_INCLUDES@