diff --git a/target/linux/ramips/dts/mt7628an_asus_rt-ac1200.dtsi b/target/linux/ramips/dts/mt7628an_asus_rt-ac1200.dtsi
index d8d42454476..dbba801425e 100644
--- a/target/linux/ramips/dts/mt7628an_asus_rt-ac1200.dtsi
+++ b/target/linux/ramips/dts/mt7628an_asus_rt-ac1200.dtsi
@@ -111,6 +111,7 @@
 
 &esw {
 	mediatek,portmap = <0x3e>;
+	mediatek,led_source = <4>;
 };
 
 &wmac {