diff --git a/sys/cam/cam_periph.c b/sys/cam/cam_periph.c
index 57acd907d662..bfc98024bd50 100644
--- a/sys/cam/cam_periph.c
+++ b/sys/cam/cam_periph.c
@@ -643,8 +643,9 @@ cam_periph_invalidate(struct cam_periph *periph)
 	CAM_DEBUG(periph->path, CAM_DEBUG_INFO, ("Periph invalidated\n"));
 	if ((periph->flags & CAM_PERIPH_ANNOUNCED) && !rebooting) {
 		struct sbuf sb;
+		char buffer[160];
 
-		sbuf_new(&sb, NULL, 160, SBUF_FIXEDLEN);
+		sbuf_new(&sb, buffer, 160, SBUF_FIXEDLEN);
 		xpt_denounce_periph_sbuf(periph, &sb);
 		sbuf_finish(&sb);
 		sbuf_putbuf(&sb);