diff --git a/boards/migrations/0005_auto.py b/boards/migrations/0005_auto.py
--- a/boards/migrations/0005_auto.py
+++ b/boards/migrations/0005_auto.py
@@ -18,12 +18,6 @@ class Migration(SchemaMigration):
         ))
         db.create_unique(m2m_table_name, ['from_post_id', 'to_post_id'])
 
-        for post in Post.objects.all():
-            if post.parent != NO_PARENT:
-                parent = Post.objects.get(id=post.parent)
-                parent.replies.add(post)
-
-
     def backwards(self, orm):
         # Removing M2M table for field replies on 'Post'
         db.delete_table(db.shorten_name(u'boards_post_replies'))