diff --git a/arch/arm/boot/dts/st/stm32mp15xx-dhcor-som.dtsi b/arch/arm/boot/dts/st/stm32mp15xx-dhcor-som.dtsi
index bba19f21e527..89881a26c614 100644
--- a/arch/arm/boot/dts/st/stm32mp15xx-dhcor-som.dtsi
+++ b/arch/arm/boot/dts/st/stm32mp15xx-dhcor-som.dtsi
@@ -227,8 +227,8 @@
 &m4_rproc {
 	memory-region = <&retram>, <&mcuram>, <&mcuram2>, <&vdev0vring0>,
 			<&vdev0vring1>, <&vdev0buffer>;
-	mboxes = <&ipcc 0>, <&ipcc 1>, <&ipcc 2>;
-	mbox-names = "vq0", "vq1", "shutdown";
+	mboxes = <&ipcc 0>, <&ipcc 1>, <&ipcc 2>, <&ipcc 3>;
+	mbox-names = "vq0", "vq1", "shutdown", "detach";
 	interrupt-parent = <&exti>;
 	interrupts = <68 1>;
 	status = "okay";