diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index 722ff38b042b122806f0b07306c08904ceae2e65..32b4ce6ec35694b2d3272780ca4167d2cd0a182d 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -297,6 +297,39 @@ static int ath10k_mac_vif_sta_fix_wep_key(struct ath10k_vif *arvif)
 	return 0;
 }
 
+static int ath10k_mac_vif_update_wep_key(struct ath10k_vif *arvif,
+					 struct ieee80211_key_conf *key)
+{
+	struct ath10k *ar = arvif->ar;
+	struct ath10k_peer *peer;
+	int ret;
+
+	lockdep_assert_held(&ar->conf_mutex);
+
+	list_for_each_entry(peer, &ar->peers, list) {
+		if (!memcmp(peer->addr, arvif->vif->addr, ETH_ALEN))
+			continue;
+
+		if (!memcmp(peer->addr, arvif->bssid, ETH_ALEN))
+			continue;
+
+		if (peer->keys[key->keyidx] == key)
+			continue;
+
+		ath10k_dbg(ar, ATH10K_DBG_MAC, "mac vif vdev %i update key %i needs update\n",
+			   arvif->vdev_id, key->keyidx);
+
+		ret = ath10k_install_peer_wep_keys(arvif, peer->addr);
+		if (ret) {
+			ath10k_warn(ar, "failed to update wep keys on vdev %i for peer %pM: %d\n",
+				    arvif->vdev_id, peer->addr, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
 /*********************/
 /* General utilities */
 /*********************/
@@ -3967,6 +4000,14 @@ static int ath10k_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 		if (cmd == DISABLE_KEY)
 			ath10k_clear_vdev_key(arvif, key);
 
+		/* When WEP keys are uploaded it's possible that there are
+		 * stations associated already (e.g. when merging) without any
+		 * keys. Static WEP needs an explicit per-peer key upload.
+		 */
+		if (vif->type == NL80211_IFTYPE_ADHOC &&
+		    cmd == SET_KEY)
+			ath10k_mac_vif_update_wep_key(arvif, key);
+
 		/* 802.1x never sets the def_wep_key_idx so each set_key()
 		 * call changes default tx key.
 		 *