diff --git a/test/PMATestCase.php b/test/PMATestCase.php
index 2b00ed97b3..c20e04fb67 100644
--- a/test/PMATestCase.php
+++ b/test/PMATestCase.php
@@ -49,5 +49,6 @@ class PMATestCase extends PHPUnit_Framework_TestCase
         $attrInstance = new ReflectionProperty('PMA\libraries\Response', '_instance');
         $attrInstance->setAccessible(true);
         $attrInstance->setValue($mockResponse);
+        $attrInstance->setValue($restoreInstance);
     }
 }
\ No newline at end of file