diff --git a/lib/libsbuf/Makefile b/lib/libsbuf/Makefile
index 40d6c157be78..222b4d116b08 100644
--- a/lib/libsbuf/Makefile
+++ b/lib/libsbuf/Makefile
@@ -2,6 +2,7 @@
 
 LIB=	sbuf
 SRCS=	subr_sbuf.c 
+WARNS?= 2
 
 .PATH:	${.CURDIR}/../../sys/kern