diff --git a/target/linux/ath79/dts/ar9342_ubnt_bullet-m-xw.dts b/target/linux/ath79/dts/ar9342_ubnt_bullet-m-xw.dts
index c448ac4e61..a008b51130 100644
--- a/target/linux/ath79/dts/ar9342_ubnt_bullet-m-xw.dts
+++ b/target/linux/ath79/dts/ar9342_ubnt_bullet-m-xw.dts
@@ -13,6 +13,7 @@
 	phy4: ethernet-phy@4 {
 		phy-mode = "rgmii";
 		reg = <4>;
+		max-speed = <100>;
 	};
 };