diff --git a/tests/javascript/index.php b/tests/javascript/index.php
index c1cff287723474549ec79c5f056081a692d672fe..b242a9bf04be15a1b00bde1a1f4780b62e235e13 100644
--- a/tests/javascript/index.php
+++ b/tests/javascript/index.php
@@ -855,7 +855,8 @@ function PiwikTest() {
         startTime = new Date();
         tracker.hook.test._beforeUnloadHandler();
         stopTime = new Date();
-        ok( (stopTime.getTime() - startTime.getTime()) < 500, 'beforeUnloadHandler()' );
+        var msSinceStarted = (stopTime.getTime() - startTime.getTime());
+        ok( msSinceStarted < 500, 'beforeUnloadHandler(): ' + msSinceStarted + ' was greater than 500 ' );
 
         tracker.setLinkTrackingTimer(2000);
         startTime = new Date();