diff --git a/Makefile.am b/Makefile.am
index 66de539..8d0448e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,4 +1,6 @@
 
+ACLOCAL_AMFLAGS = -I m4
+
 SUBDIRS = deps src test
 
 ##