diff --git a/app/controllers/forums_controller.rb b/app/controllers/forums_controller.rb
index 00b19366287..ec02d4e5a18 100644
--- a/app/controllers/forums_controller.rb
+++ b/app/controllers/forums_controller.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class ForumsController < ApplicationController
 
   skip_before_action :preload_json, :check_xhr