diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index a2e07d14..cc15d55d 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
 class ApplicationController < ActionController::Base
   protect_from_forgery