diff --git a/modules/vimeo/pages.py b/modules/vimeo/pages.py
index 77854cc4d973dddf2dd0fcab95b03737f23e5058..fd3dfbb2e910ba299e7c85d5357279ae9013bd29 100644
--- a/modules/vimeo/pages.py
+++ b/modules/vimeo/pages.py
@@ -149,6 +149,7 @@ class VimeoItem(ItemElement):
     obj_date = DateTime(CleanText('./upload_date'))
     obj__is_hd = CleanText('./@is_hd')
     obj_duration = VimeoDuration(CleanText('./duration'))
+    obj_ext = u'mp4'
 
     def obj_thumbnail(self):
         t = CleanText('./thumbnails/thumbnail[1]', default='')(self)