diff --git a/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac b/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
index 3c3b1e62e74..242e1e6efee 100644
--- a/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
+++ b/target/linux/ramips/mt7621/base-files/etc/hotplug.d/ieee80211/10_fix_wifi_mac
@@ -47,7 +47,6 @@ case "$board" in
 		;;
 	tenbay,t-mb5eu-v01)
 		hw_mac_addr="$(mtd_get_mac_binary factory 0x4)"
-		[ "$PHYNBR" = "0" ] && macaddr_add $hw_mac_addr "1" > /sys${DEVPATH}/macaddress
-		[ "$PHYNBR" = "1" ] && macaddr_add $hw_mac_addr "-1" > /sys${DEVPATH}/macaddress
+		[ "$PHYNBR" = "1" ] &&  macaddr_add $hw_mac_addr "0x100000" > /sys${DEVPATH}/macaddress
 		;;
 esac