diff --git a/lib/devise/mapping.rb b/lib/devise/mapping.rb
index bef62234..0d030b46 100644
--- a/lib/devise/mapping.rb
+++ b/lib/devise/mapping.rb
@@ -78,6 +78,8 @@ module Devise
 
       if options.has_key?(:only)
         @used_routes = self.routes & Array(options[:only]).map(&singularizer)
+      elsif options[:skip] == :all
+        @used_routes = []
       else
         @used_routes = self.routes - Array(options[:skip]).map(&singularizer)
       end
diff --git a/test/mapping_test.rb b/test/mapping_test.rb
index 2a60d57f..e9f50503 100644
--- a/test/mapping_test.rb
+++ b/test/mapping_test.rb
@@ -31,6 +31,10 @@ class MappingTest < ActiveSupport::TestCase
     assert_equal "admin_area", Devise.mappings[:admin].path
   end
 
+  test 'allows to skip all routes' do
+    assert_equal [], Devise.mappings[:skip_admin].used_routes
+  end
+
   test 'sign_out_via defaults to :get' do
     assert_equal :get, Devise.mappings[:user].sign_out_via
   end
diff --git a/test/rails_app/config/routes.rb b/test/rails_app/config/routes.rb
index 602b14a8..296e9afe 100644
--- a/test/rails_app/config/routes.rb
+++ b/test/rails_app/config/routes.rb
@@ -50,6 +50,8 @@ Rails.application.routes.draw do
   constraints(:host => /192\.168\.1\.\d\d\d/) do
     devise_for :homebase_admin, :class_name => "Admin", :path => "homebase"
   end
+
+  devise_for :skip_admin, :class_name => "Admin", :skip => :all
   
   # Routes for format=false testing
   devise_for :htmlonly_admin, :class_name => "Admin", :skip => [:confirmations, :unlocks], :path => "htmlonly_admin", :format => false, :skip_helpers => [:confirmations, :unlocks]