diff --git a/apps/reader/models.py b/apps/reader/models.py
index fc4af8fe4..f9698ed3d 100644
--- a/apps/reader/models.py
+++ b/apps/reader/models.py
@@ -351,7 +351,7 @@ class UserSubscription(models.Model):
         
         for story_id in set(story_ids):
             try:
-                story = MStory.get_story(story_feed_id=self.feed_id, story_guid=story_id)
+                story = MStory.objects.get(story_feed_id=self.feed_id, story_guid=story_id)
             except MStory.DoesNotExist:
                 # Story has been deleted, probably by feed_fetcher.
                 continue
diff --git a/apps/rss_feeds/models.py b/apps/rss_feeds/models.py
index 1cc8d362c..9fc884baf 100644
--- a/apps/rss_feeds/models.py
+++ b/apps/rss_feeds/models.py
@@ -1401,7 +1401,7 @@ class MFeedPage(mongo.Document):
 
 class MStory(mongo.Document):
     '''A feed item'''
-    story_feed_id            = mongo.IntField()
+    story_feed_id            = mongo.IntField(unique_with='story_guid')
     story_date               = mongo.DateTimeField()
     story_title              = mongo.StringField(max_length=1024)
     story_content            = mongo.StringField()