diff --git a/bin/cat/Makefile b/bin/cat/Makefile
index 672a4eeeeff5..689dd4d28d08 100644
--- a/bin/cat/Makefile
+++ b/bin/cat/Makefile
@@ -2,5 +2,6 @@
 # $FreeBSD$
 
 PROG=	cat
+WARNS?=	6
 
 .include <bsd.prog.mk>