diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 7d5546600b..70c337c44b 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -207,9 +207,10 @@ static void pc_init1(MachineState *machine,
                               pci_memory, ram_memory);
         pcms->bus = pci_bus;
 
-        piix3 = piix3_create(pci_bus, &isa_bus);
+        piix3 = piix3_create(pci_bus);
         piix3->pic = x86ms->gsi;
         piix3_devfn = piix3->dev.devfn;
+        isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(piix3), "isa.0"));
     } else {
         pci_bus = NULL;
         i440fx_state = NULL;
diff --git a/hw/isa/piix3.c b/hw/isa/piix3.c
index 89064eb837..d57a7fe6d6 100644
--- a/hw/isa/piix3.c
+++ b/hw/isa/piix3.c
@@ -417,7 +417,7 @@ static void piix3_register_types(void)
 
 type_init(piix3_register_types)
 
-PIIX3State *piix3_create(PCIBus *pci_bus, ISABus **isa_bus)
+PIIX3State *piix3_create(PCIBus *pci_bus)
 {
     PIIX3State *piix3;
     PCIDevice *pci_dev;
@@ -426,7 +426,6 @@ PIIX3State *piix3_create(PCIBus *pci_bus, ISABus **isa_bus)
 
     pci_dev = pci_create_simple_multifunction(pci_bus, -1, true, type);
     piix3 = PIIX3_PCI_DEVICE(pci_dev);
-    *isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(piix3), "isa.0"));
 
     return piix3;
 }
diff --git a/include/hw/southbridge/piix.h b/include/hw/southbridge/piix.h
index 9a2dd93c2d..f805fb8683 100644
--- a/include/hw/southbridge/piix.h
+++ b/include/hw/southbridge/piix.h
@@ -68,6 +68,6 @@ DECLARE_INSTANCE_CHECKER(PIIX3State, PIIX3_PCI_DEVICE,
 #define TYPE_PIIX3_XEN_DEVICE "PIIX3-xen"
 #define TYPE_PIIX4_PCI_DEVICE "piix4-isa"
 
-PIIX3State *piix3_create(PCIBus *pci_bus, ISABus **isa_bus);
+PIIX3State *piix3_create(PCIBus *pci_bus);
 
 #endif