diff --git a/target/linux/ath79/dts/qca9563_tplink_re450-v2.dts b/target/linux/ath79/dts/qca9563_tplink_re450-v2.dts
index 28fefe224d4..16bc26c9781 100644
--- a/target/linux/ath79/dts/qca9563_tplink_re450-v2.dts
+++ b/target/linux/ath79/dts/qca9563_tplink_re450-v2.dts
@@ -180,6 +180,7 @@
 &eth0 {
 	status = "okay";
 
+	phy-mode = "sgmii";
 	phy-handle = <&phy4>;
 
 	mtd-mac-address = <&info 0x8>;
diff --git a/target/linux/ath79/dts/qca9563_ubnt_unifiac-lite.dtsi b/target/linux/ath79/dts/qca9563_ubnt_unifiac-lite.dtsi
index 8248e060c5e..b9a5b55cd6b 100644
--- a/target/linux/ath79/dts/qca9563_ubnt_unifiac-lite.dtsi
+++ b/target/linux/ath79/dts/qca9563_ubnt_unifiac-lite.dtsi
@@ -22,5 +22,6 @@
 	status = "okay";
 
 	mtd-mac-address = <&art 0x0>;
+	phy-mode = "sgmii";
 	phy-handle = <&phy4>;
 };