diff --git a/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts b/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts
index e3a76037d4..4c98c85dee 100644
--- a/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts
+++ b/target/linux/ramips/dts/mt7620a_asus_rt-ac51u.dts
@@ -36,7 +36,7 @@
 };
 
 &ethernet {
-	mtd-mac-address = <&factory 0x4>;
+	mtd-mac-address = <&factory 0x22>;
 };
 
 &state_default {
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 c1dbf8d71d..417d3d0271 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
@@ -236,7 +236,6 @@ ramips_setup_macs()
 
 	case $board in
 	aigale,ai-br100|\
-	asus,rt-ac51u|\
 	asus,rt-n12p|\
 	asus,rt-n14u|\
 	bdcom,wap2100-sk|\
@@ -272,6 +271,7 @@ ramips_setup_macs()
 		wan_mac=$(mtd_get_mac_binary factory 0x2e)
 		label_mac=$(mtd_get_mac_binary factory 0x4)
 		;;
+	asus,rt-ac51u|\
 	asus,rt-ac54u)
 		wan_mac=$(mtd_get_mac_binary factory 0x28)
 		label_mac=$wan_mac