diff --git a/pandora/archive/models.py b/pandora/archive/models.py
index 84c2151b..8f019aa9 100644
--- a/pandora/archive/models.py
+++ b/pandora/archive/models.py
@@ -161,6 +161,8 @@ class File(models.Model):
             for type in ox.movie.EXTENSIONS:
                 if data['extension'] in ox.movie.EXTENSIONS[type]:
                     data['type'] = type
+        if 'part' in data and isinstance(data['part'], int):
+            data['part'] = str(data['part'])
         return data
 
     def normalize_path(self):