diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index 1641db3..3395ca7 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -165,7 +165,7 @@
 
 	for (prio = q->bands-1; prio >= 0; prio--) {
 		qdisc = q->queues[prio];
-		if ((len = qdisc->ops->drop(qdisc)) != 0) {
+		if (qdisc->ops->drop && (len = qdisc->ops->drop(qdisc)) != 0) {
 			sch->q.qlen--;
 			return len;
 		}