diff --git a/classes/ProductSupplier.php b/classes/ProductSupplier.php
index f5e239ccb..646a68d01 100644
--- a/classes/ProductSupplier.php
+++ b/classes/ProductSupplier.php
@@ -66,7 +66,7 @@ class ProductSupplierCore extends ObjectModel
 		'table' => 'product_supplier',
 		'primary' => 'id_product_supplier',
 		'fields' => array(
-			'product_supplier_reference' => array('type' => self::TYPE_INT, 'validate' => 'isReference', 'size' => 32),
+			'product_supplier_reference' => array('type' => self::TYPE_STRING, 'validate' => 'isReference', 'size' => 32),
 			'id_product' => 				array('type' => self::TYPE_INT, 'validate' => 'isUnsignedId', 'required' => true),
 			'id_product_attribute' => 		array('type' => self::TYPE_INT, 'validate' => 'isUnsignedId', 'required' => true),
 			'id_supplier' => 				array('type' => self::TYPE_INT, 'validate' => 'isUnsignedId', 'required' => true),