diff --git a/test/classes/PMA_Config_test.php b/test/classes/PMA_Config_test.php
index f841b6b311..464d1c7a7d 100644
--- a/test/classes/PMA_Config_test.php
+++ b/test/classes/PMA_Config_test.php
@@ -57,6 +57,7 @@ class PMA_ConfigTest extends PHPUnit_Framework_TestCase
      */
     protected function tearDown()
     {
+        unset($this->object);
     }
 
     /**