diff --git a/classes/Pack.php b/classes/Pack.php
index b43336bc4..9abe73d22 100644
--- a/classes/Pack.php
+++ b/classes/Pack.php
@@ -214,7 +214,7 @@ class PackCore extends Product
 	*/
 	public static function addItem($id_product, $id_item, $qty)
 	{
-		return Db::getInstance()->update('product', array('cache_is_pack', 1), 'id_product = '.(int)$id_product) &&
+		return Db::getInstance()->update('product', array('cache_is_pack' => 1), 'id_product = '.(int)$id_product) &&
 			Db::getInstance()->insert('pack', array('id_product_pack' => (int)$id_product, 'id_product_item' => (int)$id_item, 'quantity' => (int)$qty)) &&
 			Configuration::updateGlobalValue('PS_PACK_FEATURE_ACTIVE', '1');
 	}