diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 45efb7e5d725..a2ad2dbd04d9 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -2084,6 +2084,9 @@ static int __init iommu_init_pci(struct amd_iommu *iommu)
 	/* Prevent binding other PCI device drivers to IOMMU devices */
 	iommu->dev->match_driver = false;
 
+	/* ACPI _PRT won't have an IRQ for IOMMU */
+	iommu->dev->irq_managed = 1;
+
 	pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
 			      &iommu->cap);