diff --git a/sys/conf/files b/sys/conf/files
index 9ff4e4d1a25..ce1f2a1e829 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -658,6 +658,7 @@ kern/subr_module.c	standard
 kern/subr_prf.c		standard
 kern/subr_prof.c	standard
 kern/subr_rman.c	standard
+kern/subr_sbuf.c	standard
 kern/subr_scanf.c	standard
 kern/subr_taskqueue.c	standard
 kern/subr_xxx.c		standard