diff --git a/tx.c b/tx.c
index 249b3125..3c76142c 100644
--- a/tx.c
+++ b/tx.c
@@ -210,6 +210,10 @@ static void
 mt76_check_agg_ssn(struct mt76_txq *mtxq, struct sk_buff *skb)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+
+	if (!ieee80211_is_data_qos(hdr->frame_control))
+		return;
+
 	mtxq->agg_ssn = le16_to_cpu(hdr->seq_ctrl) + 0x10;
 }