diff --git a/mt7615/init.c b/mt7615/init.c
index 58f281b0..86642866 100644
--- a/mt7615/init.c
+++ b/mt7615/init.c
@@ -405,6 +405,8 @@ int mt7615_register_ext_phy(struct mt7615_dev *dev)
 	mphy->antenna_mask = BIT(hweight8(phy->chainmask)) - 1;
 	mt7615_init_wiphy(mphy->hw);
 
+	mphy->hw->wiphy->perm_addr[5]++;
+
 	/* second phy can only handle 5 GHz */
 	mphy->sband_2g.sband.n_channels = 0;
 	mphy->hw->wiphy->bands[NL80211_BAND_2GHZ] = NULL;