diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 51298d749824..209eb85b6c27 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3194,6 +3194,7 @@ again:
 			 * alignment and size).
 			 */
 			ret = -EUCLEAN;
+			mutex_unlock(&fs_info->delete_unused_bgs_mutex);
 			goto error;
 		}