diff --git a/usr.bin/compress/Makefile b/usr.bin/compress/Makefile
index a586b97fcfc..45c0814add3 100644
--- a/usr.bin/compress/Makefile
+++ b/usr.bin/compress/Makefile
@@ -5,6 +5,7 @@ PROG=	compress
 SRCS=	compress.c zopen.c
 LINKS=	${BINDIR}/compress ${BINDIR}/uncompress
 MLINKS=	compress.1 uncompress.1
+WARNS?=	6
 
 # XXX zopen is not part of libc
 # MAN=zopen.3