diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c
index 95c9275f47668d8b1ee801fe4e9d42abea9aa730..0cfbff62623fc54448f8ca591a14a84e7772bec0 100644
--- a/hw/s390x/s390-virtio-bus.c
+++ b/hw/s390x/s390-virtio-bus.c
@@ -47,6 +47,8 @@
 
 #define VIRTIO_EXT_CODE   0x2603
 
+static void virtio_s390_bus_new(VirtioBusState *bus, VirtIOS390Device *dev);
+
 static const TypeInfo s390_virtio_bus_info = {
     .name = TYPE_S390_VIRTIO_BUS,
     .parent = TYPE_BUS,
@@ -664,7 +666,7 @@ static const TypeInfo s390_virtio_bridge_info = {
 
 /* virtio-s390-bus */
 
-void virtio_s390_bus_new(VirtioBusState *bus, VirtIOS390Device *dev)
+static void virtio_s390_bus_new(VirtioBusState *bus, VirtIOS390Device *dev)
 {
     DeviceState *qdev = DEVICE(dev);
     BusState *qbus;
diff --git a/hw/s390x/s390-virtio-bus.h b/hw/s390x/s390-virtio-bus.h
index 991f9e2527bee63172742b5c50ed44891e27afe3..ac81bd89eee52cdae2d31910d8ddb8b1f43ac3e8 100644
--- a/hw/s390x/s390-virtio-bus.h
+++ b/hw/s390x/s390-virtio-bus.h
@@ -79,8 +79,6 @@ typedef struct VirtioBusClass VirtioS390BusClass;
 
 typedef struct VirtIOS390Device VirtIOS390Device;
 
-void virtio_s390_bus_new(VirtioBusState *bus, VirtIOS390Device *dev);
-
 typedef struct VirtIOS390DeviceClass {
     DeviceClass qdev;
     int (*init)(VirtIOS390Device *dev);
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 930531b127963fc8e70c69f878da2d9c187bbfa6..0591dc2fb078c84be2ec4b461c237d15511735e8 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -27,6 +27,8 @@
 #include "virtio-ccw.h"
 #include "trace.h"
 
+static void virtio_ccw_bus_new(VirtioBusState *bus, VirtioCcwDevice *dev);
+
 static int virtual_css_bus_reset(BusState *qbus)
 {
     /* This should actually be modelled via the generic css */
@@ -1060,7 +1062,7 @@ static const TypeInfo virtual_css_bridge_info = {
 
 /* virtio-ccw-bus */
 
-void virtio_ccw_bus_new(VirtioBusState *bus, VirtioCcwDevice *dev)
+static void virtio_ccw_bus_new(VirtioBusState *bus, VirtioCcwDevice *dev)
 {
     DeviceState *qdev = DEVICE(dev);
     BusState *qbus;
diff --git a/hw/s390x/virtio-ccw.h b/hw/s390x/virtio-ccw.h
index 8599248fc54bf85af91a7de98c93abb99104fc1b..04ba1b99ee5ccf06db980da4c00ccdc373b30798 100644
--- a/hw/s390x/virtio-ccw.h
+++ b/hw/s390x/virtio-ccw.h
@@ -60,8 +60,6 @@ typedef struct VirtioBusClass VirtioCcwBusClass;
 
 typedef struct VirtioCcwDevice VirtioCcwDevice;
 
-void virtio_ccw_bus_new(VirtioBusState *bus, VirtioCcwDevice *dev);
-
 typedef struct VirtIOCCWDeviceClass {
     DeviceClass parent_class;
     int (*init)(VirtioCcwDevice *dev);
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 1269a2280008919fdb10e6f182f969de0cd817c2..6278427d5b24bfd4269bd496d3abd42d30a0709e 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -98,6 +98,8 @@
 /* HACK for virtio to determine if it's running a big endian guest */
 bool virtio_is_big_endian(void);
 
+static void virtio_pci_bus_new(VirtioBusState *bus, VirtIOPCIProxy *dev);
+
 /* virtio device */
 /* DeviceState to VirtIOPCIProxy. For use off data-path. TODO: use QOM. */
 static inline VirtIOPCIProxy *to_virtio_pci_proxy(DeviceState *d)
@@ -1524,7 +1526,7 @@ static const TypeInfo virtio_rng_pci_info = {
 
 /* virtio-pci-bus */
 
-void virtio_pci_bus_new(VirtioBusState *bus, VirtIOPCIProxy *dev)
+static void virtio_pci_bus_new(VirtioBusState *bus, VirtIOPCIProxy *dev)
 {
     DeviceState *qdev = DEVICE(dev);
     BusState *qbus;
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index ac718248e15dec8e0f72d462531078b959bf1d76..35ae6aceb01b77840c24b247f0b120b7e6e91315 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -201,7 +201,6 @@ struct VirtIORngPCI {
 };
 
 void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev);
-void virtio_pci_bus_new(VirtioBusState *bus, VirtIOPCIProxy *dev);
 
 /* Virtio ABI version, if we increment this, we break the guest driver. */
 #define VIRTIO_PCI_ABI_VERSION          0