diff --git a/Tests/Framework/AssertTest.php b/Tests/Framework/AssertTest.php
index b57055f4bd1..5517d48fc31 100644
--- a/Tests/Framework/AssertTest.php
+++ b/Tests/Framework/AssertTest.php
@@ -66,6 +66,7 @@
 class Framework_AssertTest extends PHPUnit_Framework_TestCase
 {
     protected $filesDirectory;
+    protected $html;
 
     protected function setUp()
     {