diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 78f83de7e955..5ebf31f50c06 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -975,6 +975,8 @@ static int mtk_iommu_of_xlate(struct device *dev,
 			return -EINVAL;
 
 		dev_iommu_priv_set(dev, platform_get_drvdata(m4updev));
+
+		put_device(&m4updev->dev);
 	}
 
 	return iommu_fwspec_add_ids(dev, args->args, 1);