diff --git a/Makefile.am b/Makefile.am
index 631289c98..d7b65c143 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -40,4 +40,4 @@ mrproper: maintainer-clean
 	rm -f `find $(top_srcdir) -type f -name "*.rej" -print`
 
 maintainer-clean-local:
-	rm -rf $(top_srcdir)/m4/*.m4
+	rm -rf $(top_srcdir)/m4