diff --git a/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts b/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts
index fe72abe0cf..eb19f7da99 100644
--- a/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts
+++ b/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts
@@ -10,6 +10,7 @@
 	model = "Asus RT-AC51U";
 
 	aliases {
+		label-mac-device = &ethernet;
 		led-boot = &led_power;
 		led-failsafe = &led_power;
 		led-running = &led_power;
@@ -118,7 +119,7 @@
 
 &ethernet {
 	status = "okay";
-	mtd-mac-address = <&factory 0x22>;
+	mtd-mac-address = <&factory 0x28>;
 	mediatek,portmap = "wllll";
 };
 
diff --git a/target/linux/ramips/mt7620/base-files/etc/board.d/02_network b/target/linux/ramips/mt7620/base-files/etc/board.d/02_network
index 1d37db58c7..5bd2aeb603 100755
--- a/target/linux/ramips/mt7620/base-files/etc/board.d/02_network
+++ b/target/linux/ramips/mt7620/base-files/etc/board.d/02_network
@@ -273,8 +273,7 @@ ramips_setup_macs()
 		label_mac=$(mtd_get_mac_binary factory 0x4)
 		;;
 	asus,rt-ac51u)
-		wan_mac=$(mtd_get_mac_binary factory 0x28)
-		label_mac=$wan_mac
+		lan_mac=$(mtd_get_mac_binary factory 0x22)
 		;;
 	dlink,dch-m225)
 		lan_mac=$(mtd_get_mac_ascii factory lanmac)