diff --git a/net/sched/sch_fq.c b/net/sched/sch_fq.c
index 4b5f6d896c6d..6144b5686f13 100644
--- a/net/sched/sch_fq.c
+++ b/net/sched/sch_fq.c
@@ -1226,12 +1226,14 @@ static int fq_init(struct Qdisc *sch, struct nlattr *opt,
 		   struct netlink_ext_ack *extack)
 {
 	struct fq_sched_data *q = qdisc_priv(sch);
+	u32 mtu;
 	int i, err;
 
 	sch->limit		= 10000;
 	q->flow_plimit		= 100;
-	q->quantum		= 2 * psched_mtu(qdisc_dev(sch));
-	q->initial_quantum	= 10 * psched_mtu(qdisc_dev(sch));
+	mtu = clamp_t(u32, psched_mtu(qdisc_dev(sch)), 1, 1 << 20);
+	q->quantum		= min_t(u32, 2 * mtu, 1 << 20);
+	q->initial_quantum	= min_t(u32, 10 * mtu, 1 << 20);
 	q->flow_refill_delay	= msecs_to_jiffies(40);
 	q->flow_max_rate	= ~0UL;
 	q->time_next_delayed_flow = ~0ULL;