diff --git a/actionpack/lib/action_dispatch/routing/polymorphic_routes.rb b/actionpack/lib/action_dispatch/routing/polymorphic_routes.rb
index 49aef0bf728b933b613bf777a369501ecd296e56..e989a38d8bf3dcb952cfb62eb5b76fed02844fff 100644
--- a/actionpack/lib/action_dispatch/routing/polymorphic_routes.rb
+++ b/actionpack/lib/action_dispatch/routing/polymorphic_routes.rb
@@ -124,14 +124,7 @@ def polymorphic_url(record_or_hash_or_array, options = {})
           args.last.kind_of?(Hash) ? args.last.merge!(url_options) : args << url_options
         end
 
-        if proxy
-          proxy.send(named_route, *args)
-        else
-          # we need to use url_for, because polymorphic_url can be used in context of other than
-          # current routes (e.g. engine's routes). As named routes from engine are not included
-          # calling engine's named route directly would fail.
-          url_for _routes.url_helpers.__send__("hash_for_#{named_route}", *args)
-        end
+        (proxy || self).send(named_route, *args)
       end
 
       # Returns the path component of a URL for the given record. It uses
diff --git a/actionpack/test/dispatch/prefix_generation_test.rb b/actionpack/test/dispatch/prefix_generation_test.rb
index b28a05825038ae258a3644d484b46f94e613da58..93eccaecbdc3d18a56e89adea019f76956a29c84 100644
--- a/actionpack/test/dispatch/prefix_generation_test.rb
+++ b/actionpack/test/dispatch/prefix_generation_test.rb
@@ -50,7 +50,9 @@ def self.routes
             scope "/:omg", :omg => "awesome" do
               mount BlogEngine => "/blog", :as => "blog_engine"
             end
+            match "/posts/:id", :to => "outside_engine_generating#post", :as => :post
             match "/generate", :to => "outside_engine_generating#index"
+            match "/polymorphic_path_for_app", :to => "outside_engine_generating#polymorphic_path_for_app"
             match "/polymorphic_path_for_engine", :to => "outside_engine_generating#polymorphic_path_for_engine"
             match "/polymorphic_with_url_for", :to => "outside_engine_generating#polymorphic_with_url_for"
             match "/conflicting_url", :to => "outside_engine_generating#conflicting"
@@ -101,6 +103,7 @@ def conflicting
 
     class ::OutsideEngineGeneratingController < ActionController::Base
       include BlogEngine.routes.mounted_helpers
+      include RailsApplication.routes.url_helpers
 
       def index
         render :text => blog_engine.post_path(:id => 1)
@@ -110,6 +113,10 @@ def polymorphic_path_for_engine
         render :text => blog_engine.polymorphic_path(Post.new)
       end
 
+      def polymorphic_path_for_app
+        render :text => polymorphic_path(Post.new)
+      end
+
       def polymorphic_with_url_for
         render :text => blog_engine.url_for(Post.new)
       end
@@ -201,6 +208,11 @@ def setup
       assert_equal "/awesome/blog/posts/1", last_response.body
     end
 
+    test "polymorphic_path_for_app" do
+      get "/polymorphic_path_for_app"
+      assert_equal "/posts/1", last_response.body
+    end
+
     test "[APP] generating engine's url with url_for(@post)" do
       get "/polymorphic_with_url_for"
       assert_equal "http://example.org/awesome/blog/posts/1", last_response.body
diff --git a/actionpack/test/template/test_test.rb b/actionpack/test/template/test_test.rb
index 3d0bbba435d130d29c54ea25eeb3d1672c4003eb..bf789cd8b78be18f2ff5c15672b126c96f15bdb0 100644
--- a/actionpack/test/template/test_test.rb
+++ b/actionpack/test/template/test_test.rb
@@ -39,7 +39,7 @@ def test_link_to_person
     with_test_route_set do
       person = mock(:name => "David")
       person.class.extend ActiveModel::Naming
-      _routes.url_helpers.expects(:hash_for_mocha_mock_path).with(person).returns("/people/1")
+      expects(:mocha_mock_path).with(person).returns("/people/1")
       assert_equal '<a href="/people/1">David</a>', link_to_person(person)
     end
   end
diff --git a/railties/test/railties/mounted_engine_test.rb b/railties/test/railties/mounted_engine_test.rb
index b793a7401fcf973f6df33148296372acefff36e5..94dec405a775236c3bc007e77002ccd9c3be8e6e 100644
--- a/railties/test/railties/mounted_engine_test.rb
+++ b/railties/test/railties/mounted_engine_test.rb
@@ -15,10 +15,12 @@ def setup
 
       app_file 'config/routes.rb', <<-RUBY
         AppTemplate::Application.routes.draw do
+          resources :posts
           match "/engine_route" => "application_generating#engine_route"
           match "/engine_route_in_view" => "application_generating#engine_route_in_view"
           match "/url_for_engine_route" => "application_generating#url_for_engine_route"
           match "/polymorphic_route" => "application_generating#polymorphic_route"
+          match "/application_polymorphic_path" => "application_generating#application_polymorphic_path"
           scope "/:user", :user => "anonymous" do
             mount Blog::Engine => "/blog"
           end
@@ -59,6 +61,7 @@ class Engine < ::Rails::Engine
           resources :posts
           match '/generate_application_route', :to => 'posts#generate_application_route'
           match '/application_route_in_view', :to => 'posts#application_route_in_view'
+          match '/engine_polymorphic_path', :to => 'posts#engine_polymorphic_path'
         end
       RUBY
 
@@ -79,6 +82,10 @@ def generate_application_route
             def application_route_in_view
               render :inline => "<%= main_app.root_path %>"
             end
+
+            def engine_polymorphic_path
+              render :text => polymorphic_path(Post.new)
+            end
           end
         end
       RUBY
@@ -100,6 +107,10 @@ def url_for_engine_route
           def polymorphic_route
             render :text => polymorphic_url([blog, Blog::Post.new])
           end
+
+          def application_polymorphic_path
+            render :text => polymorphic_path(Blog::Post.new)
+          end
         end
       RUBY
 
@@ -172,6 +183,14 @@ def script_name(script_name)
       # test polymorphic routes
       get "/polymorphic_route"
       assert_equal "http://example.org/anonymous/blog/posts/44", last_response.body
+
+      # test that correct path is generated for the same polymorphic_path call in an engine
+      get "/somone/blog/engine_polymorphic_path"
+      assert_equal "/somone/blog/posts/44", last_response.body
+
+      # and in an application
+      get "/application_polymorphic_path"
+      assert_equal "/posts/44", last_response.body
     end
   end
 end