diff --git a/Makefile.am b/Makefile.am
index f0e2c3ce..b8d99f32 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -21,6 +21,8 @@
 SUBDIRS = src man conf
 MAINTAINERCLEANFILES = ChangeLog INSTALL
 
+ACLOCAL_AMFLAGS = -I m4
+
 .PHONY: ChangeLog INSTALL
 
 INSTALL: