diff --git a/arch/arm64/boot/dts/rockchip/rk3368-px5-evb.dts b/arch/arm64/boot/dts/rockchip/rk3368-px5-evb.dts
index 8cdb3bff9c55b1d8935ac03cadd6a8803d9de8f6..ff48edd8e3482bcafcf4920ecdf1b93995bd5a5b 100644
--- a/arch/arm64/boot/dts/rockchip/rk3368-px5-evb.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3368-px5-evb.dts
@@ -53,7 +53,7 @@
 	};
 
 	memory@0 {
-		reg = <0x0 0x0 0x0 0x80000000>;
+		reg = <0x0 0x0 0x0 0x40000000>;
 		device_type = "memory";
 	};