diff --git a/src/soc/amd/stoneyridge/northbridge.c b/src/soc/amd/stoneyridge/northbridge.c
index 5fb28c0..3a0c77d 100644
--- a/src/soc/amd/stoneyridge/northbridge.c
+++ b/src/soc/amd/stoneyridge/northbridge.c
@@ -506,7 +506,8 @@
 
 void SetNbEnvParams(GNB_ENV_CONFIGURATION *params)
 {
-	params->IommuSupport = TRUE;
+	const struct device *dev = SOC_IOMMU_DEV;
+	params->IommuSupport = dev && dev->enabled;
 	set_board_env_params(params);
 }