diff --git a/playground/vanilla/config/initializers/js_from_routes.rb b/playground/vanilla/config/initializers/js_from_routes.rb
index f42c4cf..c48cd9c 100644
--- a/playground/vanilla/config/initializers/js_from_routes.rb
+++ b/playground/vanilla/config/initializers/js_from_routes.rb
@@ -1,3 +1,5 @@
+require "ostruct"
+
 if Rails.env.development?
   JsFromRoutes.config do |config|
     config.file_suffix = "Api.ts"