diff --git a/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts b/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts
index ef74094bba..e97b832d4a 100644
--- a/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts
+++ b/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts
@@ -117,7 +117,7 @@
 
 &ethernet {
 	status = "okay";
-	mtd-mac-address = <&factory 0x4>;
+	mtd-mac-address = <&factory 0x22>;
 	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 ba9d34bf60..1d37db58c7 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
@@ -237,7 +237,6 @@ ramips_setup_macs()
 
 	case $board in
 	aigale,ai-br100|\
-	asus,rt-ac51u|\
 	asus,rt-n12p|\
 	asus,rt-n14u|\
 	bdcom,wap2100-sk|\
@@ -273,6 +272,10 @@ ramips_setup_macs()
 		wan_mac=$(mtd_get_mac_binary factory 0x2e)
 		label_mac=$(mtd_get_mac_binary factory 0x4)
 		;;
+	asus,rt-ac51u)
+		wan_mac=$(mtd_get_mac_binary factory 0x28)
+		label_mac=$wan_mac
+		;;
 	dlink,dch-m225)
 		lan_mac=$(mtd_get_mac_ascii factory lanmac)
 		;;