diff --git a/install-dev/upgrade/php/generate_root_category_for_multishop.php b/install-dev/upgrade/php/generate_root_category_for_multishop.php
index 39bc322f4..aac342bbb 100644
--- a/install-dev/upgrade/php/generate_root_category_for_multishop.php
+++ b/install-dev/upgrade/php/generate_root_category_for_multishop.php
@@ -14,8 +14,10 @@ function generate_root_category_for_multishop()
 	');
 	$id = Db::getInstance()->insert_id();
 	// set vars config
-	Configuration::set('PS_ROOT_CATEGORY', $id);
-	Configuration::set('PS_HOME_CATEGORY', 1);
+	Db::getInstance()->execute('INSERT INTO `'._DB_PREFIX_.'configuration` (`name`, `value`, `date_add`, `date_upd`) VALUES
+	(\'PS_ROOT_CATEGORY\', '.(int)$id.', NOW(), NOW()),
+	(\'PS_HOME_CATEGORY\', 1, NOW(), NOW())
+	');
 
 	$langs = Db::getInstance()->executeS('
 		SELECT `id_lang`