diff --git a/Unit_testing/Reporter.php b/Unit_testing/Reporter.php
index 9d3b5f1..c6e9f3d 100644
--- a/Unit_testing/Reporter.php
+++ b/Unit_testing/Reporter.php
@@ -41,7 +41,7 @@
 	 *	$reportText is a printf-style string (although we actually use vprintf because of the array)
 	 *	$printfArguments is an array of arguments to $reportText
 	 */
-	public function report( $statusText, $reportText, $printfArguments )
+	public function report( $statusText, $reportText, $printfArguments = null )
 	{
 		if ( $this->verbosity ) vprintf( $statusText . $reportText . "\n", $printfArguments );
 	}