diff --git a/lib/Cake/TestSuite/Reporter/CakeHtmlReporter.php b/lib/Cake/TestSuite/Reporter/CakeHtmlReporter.php
index 8c07e9b458d..f73bb1927cf 100644
--- a/lib/Cake/TestSuite/Reporter/CakeHtmlReporter.php
+++ b/lib/Cake/TestSuite/Reporter/CakeHtmlReporter.php
@@ -38,6 +38,7 @@ public function paintHeader() {
 		$this->paintDocumentStart();
 		$this->paintTestMenu();
 		echo "<ul class='tests'>\n";
+		ob_end_flush();
 	}
 
 /**