diff --git a/auth-server-implicit.md b/auth-server-implicit.md
index 893fd1e5..40913bb7 100755
--- a/auth-server-implicit.md
+++ b/auth-server-implicit.md
@@ -61,7 +61,7 @@ $server = new \League\OAuth2\Server\AuthorizationServer(
 
 // Enable the implicit grant on the server
 $server->enableGrantType(
-    new ImplicitGrant(),
+    new ImplicitGrant(new \DateInterval('PT1H')),
     new \DateInterval('PT1H') // access tokens will expire after 1 hour
 );
 {% endhighlight %}
@@ -113,4 +113,4 @@ $app->get('/authorize', function (ServerRequestInterface $request, ResponseInter
         
     }
 });
-{% endhighlight %}
\ No newline at end of file
+{% endhighlight %}