diff --git a/lib/devise.rb b/lib/devise.rb
index e1122053..da4bb8e1 100644
--- a/lib/devise.rb
+++ b/lib/devise.rb
@@ -397,6 +397,12 @@ module Devise
     Rails::VERSION::STRING[0,3] != "3.0"
   end
 
+  # Renegeres url helpers considering Devise.mapping
+  def self.regenerate_helpers!
+    Devise::Controllers::UrlHelpers.remove_helpers!
+    Devise::Controllers::UrlHelpers.generate_helpers!
+  end
+
   # A method used internally to setup warden manager from the Rails initialize
   # block.
   def self.configure_warden! #:nodoc:
diff --git a/lib/devise/controllers/url_helpers.rb b/lib/devise/controllers/url_helpers.rb
index b1bb46da..82d4af2b 100644
--- a/lib/devise/controllers/url_helpers.rb
+++ b/lib/devise/controllers/url_helpers.rb
@@ -18,22 +18,31 @@ module Devise
     #
     # Those helpers are added to your ApplicationController.
     module UrlHelpers
-
-      Devise::URL_HELPERS.each do |module_name, actions|
-        [:path, :url].each do |path_or_url|
-          actions.each do |action|
-            action = action ? "#{action}_" : ""
-
-            class_eval <<-URL_HELPERS, __FILE__, __LINE__ + 1
-              def #{action}#{module_name}_#{path_or_url}(resource_or_scope, *args)
-                scope = Devise::Mapping.find_scope!(resource_or_scope)
-                send("#{action}\#{scope}_#{module_name}_#{path_or_url}", *args)
-              end
-            URL_HELPERS
-          end
+      def self.remove_helpers!
+        self.instance_methods.map(&:to_s).grep(/_(url|path)$/).each do |method|
+          remove_method method
         end
       end
 
+      def self.generate_helpers!
+        mappings = Devise.mappings.values.map(&:used_routes).flatten.uniq
+        routes = Devise::URL_HELPERS.slice(*mappings)
+
+        routes.each do |module_name, actions|
+          [:path, :url].each do |path_or_url|
+            actions.each do |action|
+              action = action ? "#{action}_" : ""
+
+              class_eval <<-URL_HELPERS, __FILE__, __LINE__ + 1
+                def #{action}#{module_name}_#{path_or_url}(resource_or_scope, *args)
+                  scope = Devise::Mapping.find_scope!(resource_or_scope)
+                  send("#{action}\#{scope}_#{module_name}_#{path_or_url}", *args)
+                end
+              URL_HELPERS
+            end
+          end
+        end
+      end
     end
   end
 end
diff --git a/lib/devise/mapping.rb b/lib/devise/mapping.rb
index c833a136..d39ad55e 100644
--- a/lib/devise/mapping.rb
+++ b/lib/devise/mapping.rb
@@ -22,7 +22,8 @@ module Devise
   #   # is the modules included in the class
   #
   class Mapping #:nodoc:
-    attr_reader :singular, :scoped_path, :path, :controllers, :path_names, :class_name, :sign_out_via, :format
+    attr_reader :singular, :scoped_path, :path, :controllers, :path_names,
+                :class_name, :sign_out_via, :format, :used_routes
     alias :name :singular
 
     # Receives an object and find a scope for it. If a scope cannot be found,
@@ -72,6 +73,12 @@ module Devise
 
       @sign_out_via = options[:sign_out_via] || Devise.sign_out_via
       @format = options[:format]
+
+      @used_routes = self.routes
+      if options.has_key?(:only)
+        @used_routes = Array(options.delete(:only)).map { |s| s.to_s.singularize.to_sym } & @used_routes
+      end
+      @used_routes -= Array(options.delete(:skip)).map { |s| s.to_s.singularize.to_sym }
     end
 
     # Return modules for the mapping.
diff --git a/lib/devise/rails/routes.rb b/lib/devise/rails/routes.rb
index c6db7d5a..c7215507 100644
--- a/lib/devise/rails/routes.rb
+++ b/lib/devise/rails/routes.rb
@@ -5,6 +5,7 @@ module ActionDispatch::Routing
     def finalize_with_devise!
       finalize_without_devise!
       Devise.configure_warden!
+      Devise.regenerate_helpers!
     end
     alias_method_chain :finalize!, :devise
   end
@@ -188,11 +189,7 @@ module ActionDispatch::Routing
           raise_no_devise_method_error!(mapping.class_name)
         end
 
-        routes  = mapping.routes
-        if options.has_key?(:only)
-          routes  = Array(options.delete(:only)).map { |s| s.to_s.singularize.to_sym } & mapping.routes
-        end
-        routes -= Array(options.delete(:skip)).map { |s| s.to_s.singularize.to_sym }
+        routes  = mapping.used_routes
 
         devise_scope mapping.name do
           yield if block_given?