diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 39292535c74e1a9efa33d043a8d5a62c92ca157d..42e97d90a59a9dbd762730289771b3e802c099e2 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -517,7 +517,7 @@ static void __device_attach_async_helper(void *_dev, async_cookie_t cookie)
 	put_device(dev);
 }
 
-int __device_attach(struct device *dev, bool allow_async)
+static int __device_attach(struct device *dev, bool allow_async)
 {
 	int ret = 0;