diff --git a/arch/arm/boot/dts/rv1126-evb-thunder-boot.dtsi b/arch/arm/boot/dts/rv1126-evb-thunder-boot.dtsi
index 37359ca64e93..3b5681487f72 100644
--- a/arch/arm/boot/dts/rv1126-evb-thunder-boot.dtsi
+++ b/arch/arm/boot/dts/rv1126-evb-thunder-boot.dtsi
@@ -2,6 +2,10 @@
 	clock-frequency = <1000000>;
 };
 
+&isp_reserved {
+	size = <0x08000000>;
+};
+
 &route_dsi {
 	status = "disabled";
 };