diff --git a/db/migrate/20160719002225_add_deleted_post_index_to_posts.rb b/db/migrate/20160719002225_add_deleted_post_index_to_posts.rb
new file mode 100644
index 000000000..ec469b99c
--- /dev/null
+++ b/db/migrate/20160719002225_add_deleted_post_index_to_posts.rb
@@ -0,0 +1,5 @@
+class AddDeletedPostIndexToPosts < ActiveRecord::Migration
+  def change
+    add_index :posts, [:topic_id, :post_number], where: 'deleted_at IS NOT NULL', name: 'idx_posts_deleted_posts'
+  end
+end