1 files changed, 7 insertions, 1 deletions
diff --git a/railties/lib/rails/application/finisher.rb b/railties/lib/rails/application/finisher.rb
index c0b16a0090..b722679ec2 100644
--- a/railties/lib/rails/application/finisher.rb
+++ b/railties/lib/rails/application/finisher.rb
@@ -15,6 +15,12 @@ module Rails
         end
       end
 
+      initializer :add_to_prepare_blocks do
+        config.to_prepare_blocks.each do |block|
+          ActionDispatch::Callbacks.to_prepare(&block)
+        end
+      end
+
       initializer :add_builtin_route do |app|
         if Rails.env.development?
           app.routes_reloader.paths << File.join(RAILTIES_PATH, 'builtin', 'routes.rb')
@@ -25,7 +31,7 @@ module Rails
         app
       end
 
-      # Fires the user-supplied after_initialize block (config#after_initialize)
+      # Fires the user-supplied after_initialize block (config.after_initialize)
       initializer :after_initialize do
         config.after_initialize_blocks.each do |block|
           block.call(self)