diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 9be82ed02e0e..c38d68131d02 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3802,6 +3802,8 @@ void ieee80211_check_fast_rx(struct sta_info *sta)
 
 	rcu_read_lock();
 	key = rcu_dereference(sta->ptk[sta->ptk_idx]);
+	if (!key)
+		key = rcu_dereference(sdata->default_unicast_key);
 	if (key) {
 		switch (key->conf.cipher) {
 		case WLAN_CIPHER_SUITE_TKIP: