diff --git a/tests/Eccube/Tests/Web/AbstractWebTestCase.php b/tests/Eccube/Tests/Web/AbstractWebTestCase.php
index 4d0033a6047..91d9660a359 100644
--- a/tests/Eccube/Tests/Web/AbstractWebTestCase.php
+++ b/tests/Eccube/Tests/Web/AbstractWebTestCase.php
@@ -8,8 +8,8 @@
 abstract class AbstractWebTestCase extends WebTestCase
 {
 
-    protected $client = null;
-    static protected $server = null;
+    protected $client = NULL;
+    static protected $server = NULL;
 
     public function setUp()
     {