diff --git a/lib/discourse_solved/engine.rb b/lib/discourse_solved/engine.rb
index ec84f48..6c41a5e 100644
--- a/lib/discourse_solved/engine.rb
+++ b/lib/discourse_solved/engine.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ::DiscourseSolved
   class Engine < ::Rails::Engine
     engine_name PLUGIN_NAME