diff --git a/fs/block_dev.c b/fs/block_dev.c
index e664b0b..aff5421 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1236,6 +1236,7 @@
 	bdev = ERR_PTR(error);
 	goto out;
 }
+EXPORT_SYMBOL(lookup_bdev);
 
 /**
  * open_bdev_excl  -  open a block device by name and set it up for use