diff --git a/src/mainboard/google/myst/variants/baseboard/devicetree.cb b/src/mainboard/google/myst/variants/baseboard/devicetree.cb
index 7980101821..d3b06b9bd2 100644
--- a/src/mainboard/google/myst/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/myst/variants/baseboard/devicetree.cb
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-or-later
 chip soc/amd/phoenix
 	device domain 0 on
+		device ref iommu on end
 		device ref lpc_bridge on
 			chip ec/google/chromeec
 				device pnp 0c09.0 alias chrome_ec on end