diff --git a/target/linux/ramips/dts/TPLINK-8M-SPLIT-UBOOT.dtsi b/target/linux/ramips/dts/TPLINK-8M-SPLIT-UBOOT.dtsi
index c62079ee56..1014e48782 100644
--- a/target/linux/ramips/dts/TPLINK-8M-SPLIT-UBOOT.dtsi
+++ b/target/linux/ramips/dts/TPLINK-8M-SPLIT-UBOOT.dtsi
@@ -85,5 +85,5 @@
 
 &ethernet {
 	mtd-mac-address = <&rom 0xf100>;
-	mediatek,portmap = "llllw";
+	mediatek,portmap = "wllll";
 };