Help me please,, Pagination url problem (v.2.1)

[eluser]Unknown[/eluser]
$config['base_url'] = site_url('users/index/');
$config['per_page'] = 5;
$config['total_rows'] = $this->user_model->record_count();
$config['uri_segment'] = 3;
$config['page_query_string'] = TRUE;
$this->pagination->initialize($config);

$data['users'] = $this->user_model->get_users('users', $config['per_page'], $this->uri->segment(3));
// limit ($config['per_page'], $this->uri->segment(3))

$this->load->view('users/index', $data);

1. if path http://127.0.0.1/cidemo/?users/index/5 work
but I mouse hover pagination links 1 2 3 ..
result links http://127.0.0.1/cidemo/?users/index/&per;_page=5
I need to delete &per;_page=

$config['uri_protocol'] = 'QUERY_STRING';
$config['enable_query_strings'] = TRUE;

Thank you,,