diff --git a/app/controllers/concerns/decidim/pages_controller_override.rb b/app/controllers/concerns/decidim/pages_controller_override.rb
index 566849b83..3af01046b 100644
--- a/app/controllers/concerns/decidim/pages_controller_override.rb
+++ b/app/controllers/concerns/decidim/pages_controller_override.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Decidim
   module PagesControllerOverride
     extend ActiveSupport::Concern