diff --git a/webapp/mt/MarketBatch.php b/webapp/mt/MarketBatch.php
index 39472add..1f53cb16 100644
--- a/webapp/mt/MarketBatch.php
+++ b/webapp/mt/MarketBatch.php
@@ -50,13 +50,13 @@ class MarketBatch {
                 array_push(self::$sortedList, $meta);
             }
             usort(self::$sortedList, function ($a, $b) {
-                if ($a['_start_time_utc'] == $b['_start_time_utc']) {
+                if ($a['start_time'] == $b['start_time']) {
                     die(json_encode(array(
                         'errcode' => 500,
                         'errmsg' => 'server internal error'
                     )));
                 }
-                return $a['_start_time_utc'] < $b['_start_time_utc'];
+                return $a['start_time'] < $b['start_time'];
             });
         }
     }