diff --git a/hw/pci.c b/hw/pci.c
index 31eba9a..ceee291 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -758,7 +758,7 @@ static int pci_unregister_device(DeviceState *dev)
 }
 
 void pci_register_bar(PCIDevice *pci_dev, int region_num,
-                            pcibus_t size, int type,
+                            pcibus_t size, uint8_t type,
                             PCIMapIORegionFunc *map_func)
 {
     PCIIORegion *r;
diff --git a/hw/pci.h b/hw/pci.h
index bccab3a..25179eb 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -192,7 +192,7 @@ PCIDevice *pci_register_device(PCIBus *bus, const char *name,
                                PCIConfigWriteFunc *config_write);
 
 void pci_register_bar(PCIDevice *pci_dev, int region_num,
-                            pcibus_t size, int type,
+                            pcibus_t size, uint8_t type,
                             PCIMapIORegionFunc *map_func);
 
 int pci_add_capability(PCIDevice *pdev, uint8_t cap_id,