diff --git a/install-dev/upgrade/php/migrate_orders.php b/install-dev/upgrade/php/migrate_orders.php
index 2f6d6e76e..acc98c5f3 100644
--- a/install-dev/upgrade/php/migrate_orders.php
+++ b/install-dev/upgrade/php/migrate_orders.php
@@ -37,11 +37,14 @@ function migrate_orders()
 
 	// init insert order detail query
 	$values_order_detail = array();
-	$col_order_detail = Db::getInstance()->query('SHOW FIELDS FROM `'._DB_PREFIX_.'order_detail`');
+	$col_order_detail = Db::getInstance()->executeS('SHOW FIELDS 
+		FROM `'._DB_PREFIX_.'order_detail`');
+	foreach($col_order_detail as $k => $field)
+		$col_order_detail[$k] = $field['Field'];
+
 	if (!$col_order_detail)
 		return array('error' => 1, 'msg' => 'unable to get fields list from order_detail table');
 
-	$col_order_detail = $col_order_detail->fetchAll(PDO::FETCH_COLUMN);
 	$insert_order_detail = 'INSERT INTO `'._DB_PREFIX_.'order_detail_2` (`'.implode('`, `', $col_order_detail).'`) VALUES ';
 
 	// init insert order query