diff --git a/boards/models/post/__init__.py b/boards/models/post/__init__.py
--- a/boards/models/post/__init__.py
+++ b/boards/models/post/__init__.py
@@ -410,11 +410,6 @@ class Post(models.Model, Viewable):
                 pass
 
     def connect_threads(self, opening_posts):
-        """
-        If the referenced post is an OP in another thread,
-        make this post multi-thread.
-        """
-
         for opening_post in opening_posts:
             threads = opening_post.get_threads().all()
             for thread in threads:
@@ -423,5 +418,4 @@ class Post(models.Model, Viewable):
 
                 thread.last_edit_time = self.last_edit_time
                 thread.save(update_fields=['last_edit_time', 'bumpable'])
-
-                self.threads.add(thread)
+            self.threads.add(opening_post.get_thread())