diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index ee15c2280aea..1d7b272b3737 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -39,6 +39,8 @@
 
 extern struct kset devices_subsys; /* needed for vio_find_name() */
 
+static struct bus_type vio_bus_type;
+
 static struct vio_dev vio_bus_device  = { /* fake "parent" device */
 	.name = vio_bus_device.dev.bus_id,
 	.type = "",
@@ -388,7 +390,7 @@ static int vio_hotplug(struct device *dev, char **envp, int num_envp,
 	return 0;
 }
 
-struct bus_type vio_bus_type = {
+static struct bus_type vio_bus_type = {
 	.name = "vio",
 	.dev_attrs = vio_dev_attrs,
 	.uevent = vio_hotplug,
diff --git a/include/asm-powerpc/vio.h b/include/asm-powerpc/vio.h
index 3a0975e2adad..598d111e8098 100644
--- a/include/asm-powerpc/vio.h
+++ b/include/asm-powerpc/vio.h
@@ -63,7 +63,6 @@ struct vio_driver {
 };
 
 extern struct dma_mapping_ops vio_dma_ops;
-extern struct bus_type vio_bus_type;
 
 extern int vio_register_driver(struct vio_driver *drv);
 extern void vio_unregister_driver(struct vio_driver *drv);