diff --git a/usr.sbin/cron/lib/Makefile b/usr.sbin/cron/lib/Makefile
index 5d8dcb80cd66..51316c17ebf1 100644
--- a/usr.sbin/cron/lib/Makefile
+++ b/usr.sbin/cron/lib/Makefile
@@ -4,7 +4,7 @@ LIB=	cron
 INTERNALLIB=
 SRCS= entry.c env.c misc.c
 
-WARNS = 3
+WARNS?=	3
 
 CFLAGS+= -I${.CURDIR}/../cron
 CFLAGS+= -DLOGIN_CAP -DPAM