diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index d7014b2b28d6..10cc12ad2a2b 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3277,6 +3277,7 @@ again:
 			 * alignment and size).
 			 */
 			ret = -EUCLEAN;
+			mutex_unlock(&fs_info->delete_unused_bgs_mutex);
 			goto error;
 		}