diff --git a/Makefile.am b/Makefile.am
index d45d1b5..d2a4b22 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,4 @@
+ACLOCAL_AMFLAGS = -I m4
 SUBDIRS = po themes
 
 MAINTAINERCLEANFILES = Makefile.in aclocal.m4 ABOUT-NLS config.h.in \