diff --git a/libraries/joomla/profiler/profiler.php b/libraries/joomla/profiler/profiler.php
index db3067ede248c..7e4c900c1557b 100644
--- a/libraries/joomla/profiler/profiler.php
+++ b/libraries/joomla/profiler/profiler.php
@@ -204,7 +204,7 @@ public function getBuffer()
 	 *
 	 * @since   12.1
 	 */
-	public function setStart($startTime = 0, $startMem = 0)
+	public function setStart($startTime = 0.0, $startMem = 0)
 	{
 		$this->start       = (double) $startTime;
 		$this->previousMem = (int) $startMem / 1048576;