diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index 84030804a763..58b89b8d950e 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -1055,9 +1055,9 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 	 * exists and returns 0, we must preserve any PCI resource
 	 * assignments made by firmware for this host bridge.
 	 */
-	obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1,
-				DSM_PCI_PRESERVE_BOOT_CONFIG, NULL);
-	if (obj && obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 0)
+	obj = acpi_evaluate_dsm_typed(ACPI_HANDLE(bus->bridge), &pci_acpi_dsm_guid, 1,
+				      DSM_PCI_PRESERVE_BOOT_CONFIG, NULL, ACPI_TYPE_INTEGER);
+	if (obj && obj->integer.value == 0)
 		host_bridge->preserve_config = 1;
 	ACPI_FREE(obj);