diff --git a/tests/unit/Swift/MessageTest.php b/tests/unit/Swift/MessageTest.php
index 187b86956..92221e659 100644
--- a/tests/unit/Swift/MessageTest.php
+++ b/tests/unit/Swift/MessageTest.php
@@ -10,7 +10,9 @@ class Swift_MessageTest extends \PHPUnit_Framework_TestCase
     public function testCloning()
     {
         $message1 = new Swift_Message('subj', 'body', 'ctype');
+        $message1->setUseMemorySpool(true);
         $message2 = new Swift_Message('subj', 'body', 'ctype');
+        $message1->setUseMemorySpool(true);
         $message1_clone = clone $message1;
 
         $this->_recursiveObjectCloningCheck($message1, $message2, $message1_clone);