diff --git a/mt76x02.h b/mt76x02.h
index a8c5fdd9..e016add7 100644
--- a/mt76x02.h
+++ b/mt76x02.h
@@ -69,7 +69,6 @@ struct mt76x02_dev {
 	struct mac_address macaddr_list[8];
 
 	struct mutex phy_mutex;
-	struct mutex mutex;
 
 	u8 txdone_seq;
 	DECLARE_KFIFO_PTR(txstatus_fifo, struct mt76x02_tx_status);
diff --git a/mt76x02_util.c b/mt76x02_util.c
index 9336c0c3..9107f2ca 100644
--- a/mt76x02_util.c
+++ b/mt76x02_util.c
@@ -474,9 +474,9 @@ int mt76x02_set_rts_threshold(struct ieee80211_hw *hw, u32 val)
 	if (val != ~0 && val > 0xffff)
 		return -EINVAL;
 
-	mutex_lock(&dev->mutex);
+	mutex_lock(&dev->mt76.mutex);
 	mt76x02_mac_set_tx_protection(dev, val);
-	mutex_unlock(&dev->mutex);
+	mutex_unlock(&dev->mt76.mutex);
 
 	return 0;
 }