diff --git a/lib/libsbuf/Makefile b/lib/libsbuf/Makefile
index a443545ca6f..40d6c157be7 100644
--- a/lib/libsbuf/Makefile
+++ b/lib/libsbuf/Makefile
@@ -5,7 +5,4 @@ SRCS=	subr_sbuf.c
 
 .PATH:	${.CURDIR}/../../sys/kern
 
-SDIR= ${.CURDIR}/../../sys
-CFLAGS+=-I${SDIR}
-
 .include <bsd.lib.mk>