diff --git a/target/linux/ath79/dts/ar724x_ubnt_xm.dtsi b/target/linux/ath79/dts/ar724x_ubnt_xm.dtsi
index b36b0d4fe2e..ad216116a9e 100644
--- a/target/linux/ath79/dts/ar724x_ubnt_xm.dtsi
+++ b/target/linux/ath79/dts/ar724x_ubnt_xm.dtsi
@@ -43,6 +43,7 @@
 			partition@40000 {
 				label = "u-boot-env";
 				reg = <0x040000 0x010000>;
+				read-only;
 			};
 
 			partition@50000 {