diff --git a/usr.bin/ofed/opensm/Makefile b/usr.bin/ofed/opensm/Makefile
index 2c1f504dc191..738b6ace31a1 100644
--- a/usr.bin/ofed/opensm/Makefile
+++ b/usr.bin/ofed/opensm/Makefile
@@ -99,4 +99,6 @@ CFLAGS+=	-I${_spath:H} -DHAVE_CONFIG_H=1
 CFLAGS+=	-I${SYSROOT:U${DESTDIR}}/${INCLUDEDIR}/infiniband
 LIBADD=		opensm osmvendor osmcomp wrap pthread
 
+WARNS?=		2
+
 .include <bsd.prog.mk>