diff --git a/net/sched/sch_tbf.c b/net/sched/sch_tbf.c
index 2562a60..23b7624 100644
--- a/net/sched/sch_tbf.c
+++ b/net/sched/sch_tbf.c
@@ -348,8 +348,10 @@
 	}
 
 	sch_tree_lock(sch);
-	if (child)
+	if (child) {
+		qdisc_tree_decrease_qlen(q->qdisc, q->qdisc->q.qlen);
 		qdisc_destroy(xchg(&q->qdisc, child));
+	}
 	q->limit = qopt->limit;
 	q->mtu = qopt->mtu;
 	q->max_size = max_size;
@@ -451,8 +453,8 @@
 
 	sch_tree_lock(sch);
 	*old = xchg(&q->qdisc, new);
+	qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
 	qdisc_reset(*old);
-	sch->q.qlen = 0;
 	sch_tree_unlock(sch);
 
 	return 0;