diff --git a/beets/autotag/hooks.py b/beets/autotag/hooks.py
index cc5f37003..7df1f62f4 100644
--- a/beets/autotag/hooks.py
+++ b/beets/autotag/hooks.py
@@ -154,12 +154,12 @@ class TrackInfo(object):
     may be None. The indices ``index``, ``medium``, and ``medium_index``
     are all 1-based.
     """
-    def __init__(self, title, track_id, release_track_id=None, artist=None, artist_id=None,
-                 length=None, index=None, medium=None, medium_index=None,
-                 medium_total=None, artist_sort=None, disctitle=None,
-                 artist_credit=None, data_source=None, data_url=None,
-                 media=None, lyricist=None, composer=None, composer_sort=None,
-                 arranger=None, track_alt=None):
+    def __init__(self, title, track_id, release_track_id=None, artist=None,
+                 artist_id=None, length=None, index=None, medium=None,
+                 medium_index=None, medium_total=None, artist_sort=None,
+                 disctitle=None, artist_credit=None, data_source=None,
+                 data_url=None, media=None, lyricist=None, composer=None,
+                 composer_sort=None, arranger=None, track_alt=None):
         self.title = title
         self.track_id = track_id
         self.release_track_id = release_track_id