diff --git a/tests/TestCase.php b/tests/TestCase.php
index d61fb8d..7d941a8 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -43,6 +43,8 @@ protected function defineEnvironment($app)
         ]);
 
         $app['config']->set('response.enum', \Jiannei\Response\Laravel\Tests\Repositories\Enums\ResponseCodeEnum::class);
-        $app['config']->set('response.format', \Jiannei\Response\Laravel\Tests\Support\Format::class);
+        if ($this instanceof FormatTest) {
+            $app['config']->set('response.format', \Jiannei\Response\Laravel\Tests\Support\Format::class);
+        }
     }
 }