diff --git a/railties/test/application/routing_test.rb b/railties/test/application/routing_test.rb
index b4ff14409f8b1608d006a4d5877ec52379b2fe4d..bf2af11e9fb42717c77bbf63729e42c078dd80ca 100644
--- a/railties/test/application/routing_test.rb
+++ b/railties/test/application/routing_test.rb
@@ -218,11 +218,9 @@ def baz
     test 'routes are loaded just after initialization' do
       require "#{app_path}/config/application"
 
-      ActiveSupport.on_load(:after_initialize) do
-        ::InitializeRackApp = lambda { |env| [200, {}, ["InitializeRackApp"]] }
-      end
-
       app_file 'config/routes.rb', <<-RUBY
+        InitializeRackApp = lambda { |env| [200, {}, ["InitializeRackApp"]] }
+
         AppTemplate::Application.routes.draw do
           match 'foo', :to => ::InitializeRackApp
         end