diff --git a/hw/piix4.c b/hw/piix4.c
index 71f1f84dc0..9590e7b140 100644
--- a/hw/piix4.c
+++ b/hw/piix4.c
@@ -86,15 +86,8 @@ static const VMStateDescription vmstate_piix4 = {
 static int piix4_initfn(PCIDevice *dev)
 {
     PIIX4State *d = DO_UPCAST(PIIX4State, dev, dev);
-    uint8_t *pci_conf;
 
     isa_bus_new(&d->dev.qdev);
-
-    pci_conf = d->dev.config;
-    pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
-    pci_config_set_device_id(pci_conf, PCI_DEVICE_ID_INTEL_82371AB_0); // 82371AB/EB/MB PIIX4 PCI-to-ISA bridge
-    pci_config_set_class(pci_conf, PCI_CLASS_BRIDGE_ISA);
-
     piix4_dev = &d->dev;
     qemu_register_reset(piix4_reset, d);
     return 0;
@@ -117,6 +110,9 @@ static PCIDeviceInfo piix4_info[] = {
         .qdev.no_user = 1,
         .no_hotplug   = 1,
         .init         = piix4_initfn,
+        .vendor_id    = PCI_VENDOR_ID_INTEL,
+        .device_id    = PCI_DEVICE_ID_INTEL_82371AB_0, // 82371AB/EB/MB PIIX4 PCI-to-ISA bridge
+        .class_id     = PCI_CLASS_BRIDGE_ISA,
     },{
         /* end of list */
     }