diff --git a/Makefile.am b/Makefile.am
index f6ad55c..21cd7e1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,5 @@
+ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
+
 SUBDIRS =								\
 	panel-plugin							\
 	themes								\