diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index 3292703de7..3770575c1a 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -27,6 +27,7 @@
#include "hw/irq.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_host.h"
+#include "hw/southbridge/piix.h"
#include "hw/qdev-properties.h"
#include "hw/isa/isa.h"
#include "hw/sysbus.h"
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 183326d9fe..1c20b96571 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -257,12 +257,6 @@ typedef struct PCII440FXState PCII440FXState;
#define TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE
"igd-passthrough-i440FX"
-/*
- * Reset Control Register: PCI-accessible ISA-Compatible Register
at address
- * 0xcf9, provided by the PCI/ISA bridge (PIIX3 PCI function 0,
8086:7000).
- */
-#define RCR_IOPORT 0xcf9
-
PCIBus *i440fx_init(const char *host_type, const char *pci_type,
PCII440FXState **pi440fx_state, int *piix_devfn,
ISABus **isa_bus, qemu_irq *pic,
diff --git a/include/hw/southbridge/piix.h
b/include/hw/southbridge/piix.h
index add352456b..79ebe0089b 100644
--- a/include/hw/southbridge/piix.h
+++ b/include/hw/southbridge/piix.h
@@ -18,6 +18,12 @@ I2CBus *piix4_pm_init(PCIBus *bus, int devfn,
uint32_t smb_io_base,
qemu_irq sci_irq, qemu_irq smi_irq,
int smm_enabled, DeviceState **piix4_pm);
+/*
+ * Reset Control Register: PCI-accessible ISA-Compatible Register
at address
+ * 0xcf9, provided by the PCI/ISA bridge (PIIX3 PCI function 0,
8086:7000).
+ */
+#define RCR_IOPORT 0xcf9
+
extern PCIDevice *piix4_dev;
DeviceState *piix4_create(PCIBus *pci_bus, ISABus **isa_bus,
--
2.21.0