diff --git a/meta-xt-domd-gen4/recipes-kernel/linux/linux-renesas/r8a779f0-spider-xen.dts b/meta-xt-domd-gen4/recipes-kernel/linux/linux-renesas/r8a779f0-spider-xen.dts
index 2c686d1..ce1e4c8 100644
--- a/meta-xt-domd-gen4/recipes-kernel/linux/linux-renesas/r8a779f0-spider-xen.dts
+++ b/meta-xt-domd-gen4/recipes-kernel/linux/linux-renesas/r8a779f0-spider-xen.dts
@@ -353,6 +353,7 @@
 		iommus = <&ipmmu_hc 7>, <&ipmmu_hc 23>;
 	};
 
+	mfis_mbox	{ xen,passthrough; };
 	iccom00		{ xen,passthrough; };
 	iccom01		{ xen,passthrough; };
 	iccom02		{ xen,passthrough; };