2 RESTful controllers for the same resource

Hi everyone I want to have two restful controllers for the same
resource (Users)
One controller (UsersController) is straight in the controllers folder
and is used for singup and so on
Then i need another controller for users which is inside an admin
folder (Admin::UsersController)

In my routes.rb i have

   map.resources :users

  # Sample resource route within a namespace:
   map.namespace :admin do |admin|
     admin.resources :users
  end

When i access the /admin/users it will render the index action of the
UsersController not the Admin::UsersController
Any clues?