diff --git a/install-dev/upgrade/php/generate_order_reference.php b/install-dev/upgrade/php/generate_order_reference.php
deleted file mode 100644
index 193083abf..000000000
--- a/install-dev/upgrade/php/generate_order_reference.php
+++ /dev/null
@@ -1,19 +0,0 @@
-<?php
-
-function generate_order_reference()
-{
-	$res = true;
-	// Get all orders
-	$orders = Db::getInstance()->executeS('SELECT id_order FROM '._DB_PREFIX_.'orders');
-	foreach ($orders as $order)
-	{
-		$random_ref = '';
-		for ($i = 0, $passwd = ''; $i < 9; $i++)
-			$random_ref .= substr('ABCDEFGHIJKLMNOPQRSTUVWXYZ', mt_rand(0,25), 1);
-		$res &= Db::getInstance()->execute('
-			UPDATE '._DB_PREFIX_.'orders
-			SET reference = \''.$random_ref.'\'
-			WHERE id_order = '.(int)$order['id_order']);
-	}
-	return $res;
-}
diff --git a/install-dev/upgrade/sql/1.5.0.2.sql b/install-dev/upgrade/sql/1.5.0.2.sql
index ac59a133d..0e14d5af6 100644
--- a/install-dev/upgrade/sql/1.5.0.2.sql
+++ b/install-dev/upgrade/sql/1.5.0.2.sql
@@ -328,7 +328,7 @@ ALTER TABLE `PREFIX_order_cart_rule` ADD `id_order_invoice` INT NOT NULL DEFAULT
 ALTER TABLE `PREFIX_specific_price` ADD `id_group_shop` INT(11) UNSIGNED NOT NULL AFTER `id_shop`;
 
 /* Generate order references */
-/* PHP:generate_order_reference(); */;
+UPDATE `PREFIX_orders` SET `reference` = id_order;
 
 ALTER TABLE `PREFIX_order_detail` ADD `tax_computation_method` tinyint(1) unsigned NOT NULL default '0' AFTER `product_weight`;