diff --git a/Makefile.am b/Makefile.am
index f6d46bc3d..62f767e75 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,5 @@
 AUTOMAKE_OPTIONS = foreign
+ACLOCAL_AMFLAGS = -I m4
 
 # And these to the user and group of your webserver
 webuser = @WEB_USER@