diff --git a/app/models/post.rb b/app/models/post.rb
index 475970f136c..96510254839 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -39,6 +39,7 @@ class Post < ActiveRecord::Base
   SHORT_POST_CHARS = 1200
 
   scope :by_newest, order('created_at desc, id desc')
+  scope :by_post_number, order('post_number ASC')
   scope :with_user, includes(:user)
   scope :public_posts, -> { joins(:topic).where('topics.archetype <> ?', Archetype.private_message) }
   scope :private_posts, -> { joins(:topic).where('topics.archetype = ?', Archetype.private_message) }
diff --git a/app/serializers/topic_list_item_serializer.rb b/app/serializers/topic_list_item_serializer.rb
index 0a895a40684..7a994d9cdf6 100644
--- a/app/serializers/topic_list_item_serializer.rb
+++ b/app/serializers/topic_list_item_serializer.rb
@@ -60,7 +60,7 @@ class TopicListItemSerializer < ListableTopicSerializer
   end
 
   def excerpt
-    object.posts.first.try(:excerpt,220, strip_links: true) || nil
+    object.posts.by_post_number.first.try(:excerpt, 220, strip_links: true) || nil
   end
 
 end