diff --git a/audiorename/meta.py b/audiorename/meta.py
index d2d2d49..f724814 100644
--- a/audiorename/meta.py
+++ b/audiorename/meta.py
@@ -117,8 +117,8 @@ def enrich_metadata(self) -> None:
                             break
                 self.mb_workid = work_bottom['id']
                 self.work = work_bottom['title']
-                wh_titles = []
-                wh_ids = []
+                wh_titles: List[str] = []
+                wh_ids: List[str] = []
                 for work in work_hierarchy:
                     wh_titles.append(work['title'])
                     wh_ids.append(work['id'])
diff --git a/audiorename/musicbrainz.py b/audiorename/musicbrainz.py
index 06585e2..88964d8 100644
--- a/audiorename/musicbrainz.py
+++ b/audiorename/musicbrainz.py
@@ -163,14 +163,11 @@
     'title': str,
 })
 
-WorkRelation = TypedDict(
-    'WorkRelation', {
-        'work': WorkChild,
-        'direction': Literal['backward'],
-        'type': Literal['parts']
-    }
-)
-
+WorkRelation = TypedDict('WorkRelation', {
+    'work': WorkChild,
+    'direction': Literal['backward'],
+    'type': Literal['parts']
+})
 
 Work = TypedDict('Work', {
     'id': str,