diff --git a/CronController.php b/CronController.php
index 15edaa1..89a205c 100644
--- a/CronController.php
+++ b/CronController.php
@@ -282,7 +282,7 @@ protected function formatFileName($pattern, $task){
             array($this->logsDir, $task['command'], $task['action'], getmypid()),
             $pattern
         );
-        return preg_replace_callback('#%D\((.+)\)#U', create_function('$str', 'return date($str[1]);'), $pattern);
+        return preg_replace_callback('#%D\((.+)\)#U', function($str){return date($str[1]);}, $pattern);
     }
 
     /**