diff --git a/lib/MongoQueue.php b/lib/MongoQueue.php
index 82e2f63..e408aed 100644
--- a/lib/MongoQueue.php
+++ b/lib/MongoQueue.php
@@ -42,7 +42,7 @@ public static function push($className, $methodName, $parameters, $when, $batch
 			{
 				$job = $job['value'];
 
-				if (!isset($job['when']))
+				if (!isset($job['when']) || $job['when'] > $when)
 				{
 					$job['when'] = $when;
 					$collection->save($job);