diff --git a/tools/regression/usr.bin/Makefile b/tools/regression/usr.bin/Makefile
index f9a8e11aed3..acc6b665c6f 100644
--- a/tools/regression/usr.bin/Makefile
+++ b/tools/regression/usr.bin/Makefile
@@ -1,5 +1,5 @@
 # $FreeBSD$
 
-SUBDIR=	file2c join jot make sed uudecode uuencode xargs
+SUBDIR=	file2c join jot m4 make sed uudecode uuencode xargs
 
 .include <bsd.subdir.mk>