diff --git a/wp-cron.php b/wp-cron.php
index 45cb9f32fb..36d7662e3e 100644
--- a/wp-cron.php
+++ b/wp-cron.php
@@ -6,6 +6,11 @@ require_once('wp-config.php');
 if ( $_GET['check'] != md5(DB_PASS . '187425') )
 	exit;
 
+if ( get_option('doing_cron') > time() )
+	exit;
+
+update_option('doing_cron', time() + 30);
+
 $crons = _get_cron_array();
 $keys = array_keys($crons);
 if (!is_array($crons) || $keys[0] > time())
@@ -14,14 +19,17 @@ foreach ($crons as $timestamp => $cronhooks) {
 	if ($timestamp > time()) break;
 	foreach ($cronhooks as $hook => $keys) {
 		foreach ($keys as $key => $args) {
- 			do_action_ref_array($hook, $args['args']);
 			$schedule = $args['schedule'];
 			if ($schedule != false) {
 				$new_args = array($timestamp, $schedule, $hook, $args['args']);
 				call_user_func_array('wp_reschedule_event', $new_args);
 			}
 			wp_unschedule_event($timestamp, $hook, $args['args']);
+ 			do_action_ref_array($hook, $args['args']);
 		}
 	}
 }
+
+update_option('doing_cron', 0);
+
 ?>