diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 30b5646b2c0d..ba5324be100a 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2957,6 +2957,7 @@ again:
 			 * alignment and size).
 			 */
 			ret = -EUCLEAN;
+			mutex_unlock(&fs_info->delete_unused_bgs_mutex);
 			goto error;
 		}