diff --git a/mt7603/init.c b/mt7603/init.c
index e67b205e..22c248b5 100644
--- a/mt7603/init.c
+++ b/mt7603/init.c
@@ -140,8 +140,8 @@ mt7603_dma_sched_init(struct mt7603_dev *dev)
 static void
 mt7603_phy_init(struct mt7603_dev *dev)
 {
-	int rx_chains = BIT(dev->rx_chains) - 1;
-	int tx_chains = dev->tx_chains - 1;
+	int rx_chains = dev->mt76.antenna_mask;
+	int tx_chains = __sw_hweight8(rx_chains) - 1;
 
 	mt76_rmw(dev, MT_WF_RMAC_RMCR,
 		 (MT_WF_RMAC_RMCR_SMPS_MODE |
@@ -476,8 +476,11 @@ int mt7603_register_device(struct mt7603_dev *dev)
 	tasklet_init(&dev->pre_tbtt_tasklet, mt7603_pre_tbtt_tasklet,
 		     (unsigned long)dev);
 
-	dev->rx_chains = 2;
-	dev->tx_chains = 2;
+	/* Check for 7688, which only has 1SS */
+	dev->mt76.antenna_mask = 3;
+	if (mt76_rr(dev, MT_EFUSE_BASE + 0x64) & BIT(4))
+		dev->mt76.antenna_mask = 1;
+
 	dev->slottime = 9;
 
 	ret = mt7603_init_hardware(dev);
@@ -501,9 +504,6 @@ int mt7603_register_device(struct mt7603_dev *dev)
 	dev->mt76.led_cdev.brightness_set = mt7603_led_set_brightness;
 	dev->mt76.led_cdev.blink_set = mt7603_led_set_blink;
 
-	/* init antenna configuration */
-	dev->mt76.antenna_mask = 3;
-
 	wiphy->interface_modes =
 		BIT(NL80211_IFTYPE_STATION) |
 		BIT(NL80211_IFTYPE_AP) |
diff --git a/mt7603/mcu.c b/mt7603/mcu.c
index 92ed3db4..e44e3d12 100644
--- a/mt7603/mcu.c
+++ b/mt7603/mcu.c
@@ -481,6 +481,7 @@ static int mt7603_mcu_set_tx_power(struct mt7603_dev *dev)
 int mt7603_mcu_set_channel(struct mt7603_dev *dev)
 {
 	struct cfg80211_chan_def *chandef = &dev->mt76.chandef;
+	int n_chains = __sw_hweight8(dev->mt76.antenna_mask);
 	struct {
 		u8 control_chan;
 		u8 center_chan;
@@ -494,8 +495,8 @@ int mt7603_mcu_set_channel(struct mt7603_dev *dev)
 		.control_chan = chandef->chan->hw_value,
 		.center_chan = chandef->chan->hw_value,
 		.bw = MT_BW_20,
-		.tx_streams = dev->tx_chains,
-		.rx_streams = dev->rx_chains,
+		.tx_streams = n_chains,
+		.rx_streams = n_chains,
 	};
 	struct sk_buff *skb;
 	int ret;
diff --git a/mt7603/mt7603.h b/mt7603/mt7603.h
index 51f5c49a..3f1f388f 100644
--- a/mt7603/mt7603.h
+++ b/mt7603/mt7603.h
@@ -109,9 +109,6 @@ struct mt7603_dev {
 
 	struct mt7603_sta global_sta;
 
-	u8 rx_chains;
-	u8 tx_chains;
-
 	u8 rssi_offset[3];
 
 	u8 slottime;