diff --git a/Makefile.am b/Makefile.am
index 0970c26..ea43c24 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,5 @@
+ACLOCAL_AMFLAGS = -I m4
+
 CLEANFILES = *~
 
 sysconf_DATA = key_file