diff --git a/usr.bin/demandoc/Makefile b/usr.bin/demandoc/Makefile
index ebc1980b512..d8682a46275 100644
--- a/usr.bin/demandoc/Makefile
+++ b/usr.bin/demandoc/Makefile
@@ -7,4 +7,6 @@ PROG=	demandoc
 LDADD=	${LDMANDOC}
 DPADD=	${LIBMANDOC}
 
+WARNS?=	5
+
 .include <bsd.prog.mk>