diff --git a/src/RecaptchaServiceProvider.php b/src/RecaptchaServiceProvider.php
index df0b5f7..bd05941 100644
--- a/src/RecaptchaServiceProvider.php
+++ b/src/RecaptchaServiceProvider.php
@@ -35,8 +35,8 @@ public function boot()
      */
     public function addValidator()
     {
-        $this->app->validator->extendImplicit('recaptcha', function ($attribute, $value, $parameters) {
-            $captcha   = app('recaptcha.service');
+        $captcha   = app('recaptcha.service');
+        $this->app->validator->extendImplicit('recaptcha', function ($attribute, $value, $parameters) use($captcha) {
             $challenge = app('request')->input($captcha->getResponseKey());
 
             return $captcha->check($challenge, $value);