diff --git a/actionpack/lib/action_dispatch/railtie.rb b/actionpack/lib/action_dispatch/railtie.rb
index c202fee990f930a93453c4ecbea1f37aa716314c..69537be87652793efc704785052ae701ae52c202 100644
--- a/actionpack/lib/action_dispatch/railtie.rb
+++ b/actionpack/lib/action_dispatch/railtie.rb
@@ -10,11 +10,6 @@ class Railtie < Rails::Railtie
     config.action_dispatch.best_standards_support = true
     config.action_dispatch.tld_length = 1
 
-    # Prepare dispatcher callbacks and run 'prepare' callbacks
-    initializer "action_dispatch.prepare_dispatcher" do |app|
-      ActionDispatch::Callbacks.to_prepare { app.routes_reloader.execute_if_updated }
-    end
-
     initializer "action_dispatch.configure" do |app|
       ActionDispatch::Http::URL.tld_length = app.config.action_dispatch.tld_length
     end