diff --git a/actionpack/lib/action_dispatch/routing/mapper.rb b/actionpack/lib/action_dispatch/routing/mapper.rb
index 0b7b09ee7a7800c11e13a112c3ea0f557d66766e..f9b27a5a039a5cf86ca7519934d306d5a5dab032 100644
--- a/actionpack/lib/action_dispatch/routing/mapper.rb
+++ b/actionpack/lib/action_dispatch/routing/mapper.rb
@@ -362,11 +362,11 @@ def self.default_actions
           attr_reader :plural, :singular, :options
 
           def initialize(entities, options = {})
-            entities = entities.to_s
+            @name = entities.to_s
             @options = options
 
-            @plural   = entities.pluralize
-            @singular = entities.singularize
+            @plural   = @name.pluralize
+            @singular = @name.singularize
           end
 
           def default_actions
@@ -393,7 +393,7 @@ def action_type(action)
           end
 
           def name
-            options[:as] || plural
+            options[:as] || @name
           end
 
           def controller
@@ -438,8 +438,8 @@ def action_type(action)
             end
           end
 
-          def name
-            options[:as] || singular
+          def member_name
+            name
           end
         end
 
@@ -468,8 +468,8 @@ def resource(*resources, &block)
               post   :create if resource.actions.include?(:create)
               put    :update if resource.actions.include?(:update)
               delete :destroy if resource.actions.include?(:destroy)
-              get    :new, :as => resource.singular if resource.actions.include?(:new)
-              get    :edit, :as => resource.singular if resource.actions.include?(:edit)
+              get    :new, :as => resource.name if resource.actions.include?(:new)
+              get    :edit, :as => resource.name if resource.actions.include?(:edit)
             end
           end
 
diff --git a/actionpack/test/controller/resources_test.rb b/actionpack/test/controller/resources_test.rb
index f60045bba6086010393b0244694b008e147682e3..17c645c04c4bbfb59f01d32e35f2f2cc8756187e 100644
--- a/actionpack/test/controller/resources_test.rb
+++ b/actionpack/test/controller/resources_test.rb
@@ -16,6 +16,7 @@ class AccountsController <  ResourcesController; end
 class AdminController   <  ResourcesController; end
 class ProductsController < ResourcesController; end
 class ImagesController < ResourcesController; end
+class PreferencesController < ResourcesController; end
 
 module Backoffice
   class ProductsController < ResourcesController; end
@@ -1125,6 +1126,12 @@ def test_default_singleton_restful_route_uses_get
     end
   end
 
+  def test_singleton_resource_name_is_not_singularized
+    with_singleton_resources(:preferences) do
+      assert_singleton_restful_for :preferences
+    end
+  end
+
   protected
     def with_restful_routing(*args)
       with_routing do |set|