diff --git a/usr.sbin/fwcontrol/Makefile b/usr.sbin/fwcontrol/Makefile
--- a/usr.sbin/fwcontrol/Makefile
+++ b/usr.sbin/fwcontrol/Makefile
@@ -9,5 +9,6 @@
 
 SDIR= ${SRCTOP}/sys
 CFLAGS+=-I${.CURDIR} -I${SDIR}
+CWARNFLAGS+=	${NO_WZERO_LENGTH_BOUNDS}
 
 .include <bsd.prog.mk>