diff --git a/Makefile.am b/Makefile.am
index fdbc505f..9bf4c32c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,5 @@
+ACLOCAL_AMFLAGS = -I m4
+
 SUBDIRS = docs \
 	  src/lib/utils \
 	  src/lib/ebus \