laravel default wildcasting route shielding route registered by SomeServiceProvider

I have following route definition in my web.php:

Route::get('/captcha','Api\MyCaptchaController@captcha'); // this will return a service entry url: /captcha/default
Route::get('/{cslug1}/{cslug2}','Front\FrontController@default_index'); 

and in the CaptachaServiceProvider boot() method, we defined the /captcha/default route:

$this->app['router']->get('captcha/default', '\Mews\Captcha\CaptchaController@getCaptcha')

and above route the action which will serve /captcha/default url request. The issue is: When above url request is lauched by browser, the default wildcast route entity is hit.(/{cslug1}/{cslug2}) How to make sure the captcha/default is served by CaptchaController instead of FrontController?

via Chebli Mohamed