diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 9b7b4d7..bf38905 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -1446,9 +1446,7 @@
 {
     pcibus_t new_addr, last_addr;
     uint16_t cmd = pci_get_word(d->config + PCI_COMMAND);
-    Object *machine = qdev_get_machine();
-    ObjectClass *oc = object_get_class(machine);
-    MachineClass *mc = MACHINE_CLASS(oc);
+    MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
     bool allow_0_address = mc->pci_allow_0_address;
 
     if (type & PCI_BASE_ADDRESS_SPACE_IO) {