diff --git a/tests/Unit/EmptyRoutePrefixTest.php b/tests/Unit/EmptyRoutePrefixTest.php
index 3a23afcd..7a947209 100644
--- a/tests/Unit/EmptyRoutePrefixTest.php
+++ b/tests/Unit/EmptyRoutePrefixTest.php
@@ -14,7 +14,7 @@ protected function getEnvironmentSetUp($app): void
         $app['config']->set('graphql.route.prefix', '');
     }
 
-    public function testEmptyRoutePrefix():void
+    public function testEmptyRoutePrefix(): void
     {
         $response = $this->call('GET', '/', [
             'query' => $this->queries['examples'],