diff --git a/drivers/vfio/mdev/mdev_sysfs.c b/drivers/vfio/mdev/mdev_sysfs.c
index 249472f055097eebdebc087dc8d3a6caf56d541b..ce5dd219f2c8e2601029186726fb0eee6d0fdfc7 100644
--- a/drivers/vfio/mdev/mdev_sysfs.c
+++ b/drivers/vfio/mdev/mdev_sysfs.c
@@ -92,8 +92,8 @@ static struct kobj_type mdev_type_ktype = {
 	.release = mdev_type_release,
 };
 
-struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
-					  struct attribute_group *group)
+static struct mdev_type *add_mdev_supported_type(struct mdev_parent *parent,
+						 struct attribute_group *group)
 {
 	struct mdev_type *type;
 	int ret;