diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
index 2ace7d6ef364..7aec02f263ed 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -1001,7 +1001,7 @@ dma2: dma-controller@48001000 {
 
 		dmamux1: dma-router@48002000 {
 			compatible = "st,stm32h7-dmamux";
-			reg = <0x48002000 0x1c>;
+			reg = <0x48002000 0x40>;
 			#dma-cells = <3>;
 			dma-requests = <128>;
 			dma-masters = <&dma1 &dma2>;