diff --git a/src/PassportServiceProvider.php b/src/PassportServiceProvider.php
index ccabadd..6e6da48 100644
--- a/src/PassportServiceProvider.php
+++ b/src/PassportServiceProvider.php
@@ -200,7 +200,7 @@ public function makeAuthorizationServer()
             $this->app->make(Bridge\AccessTokenRepository::class),
             $this->app->make(Bridge\ScopeRepository::class),
             'file://'.Passport::keyPath('oauth-private.key'),
-            'file://'.Passport::keyPath('oauth-public.key')
+            app('encrypter')->getKey()
         );
     }