diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 8fb8107..0991c64 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -273,7 +273,11 @@
 	if (max_size < 0)
 		goto done;
 
-	if (qopt->limit > 0) {
+	if (q->qdisc != &noop_qdisc) {
+		err = fifo_set_limit(q->qdisc, qopt->limit);
+		if (err)
+			goto done;
+	} else if (qopt->limit > 0) {
 		child = fifo_create_dflt(sch, &bfifo_qdisc_ops, qopt->limit);
 		if (IS_ERR(child)) {
 			err = PTR_ERR(child);