CakePHP 3 controller with prefix

When I'm using a prefix (admin) I get the following error trying to access '/project/admin/user':

Missing Controller

Error: usersController could not be found.

Error: Create the class usersController below in file: src/Controller/Admin/usersController.php

<?php  namespace App\Controller\Admin;    use App\Controller\AppController;    class usersController extends AppController {    }  

I guess there's a inflection problem in the controller.
This works ok in Windows, but in Linux it only works if I rename the controller from 'UsersController.php' to 'usersController.php'.

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