diff --git a/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mdio.c b/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mdio.c
index bdfdf7a432..a1c115687e 100644
--- a/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mdio.c
+++ b/target/linux/ramips/files-4.14/drivers/net/ethernet/mediatek/mdio.c
@@ -110,7 +110,8 @@ static void phy_init(struct fe_priv *priv, struct phy_device *phy)
 	phy->autoneg = AUTONEG_ENABLE;
 	phy->speed = 0;
 	phy->duplex = 0;
-	phy->supported &= PHY_BASIC_FEATURES;
+	phy->supported &= IS_ENABLED(CONFIG_NET_MEDIATEK_MDIO_MT7620) ?
+			PHY_GBIT_FEATURES : PHY_BASIC_FEATURES;
 	phy->advertising = phy->supported | ADVERTISED_Autoneg;
 
 	phy_start_aneg(phy);