diff --git a/addons/stock/wizard/stock_change_product_qty.py b/addons/stock/wizard/stock_change_product_qty.py
index c22ade231be..49ccc90a26a 100644
--- a/addons/stock/wizard/stock_change_product_qty.py
+++ b/addons/stock/wizard/stock_change_product_qty.py
@@ -84,7 +84,7 @@ class stock_change_product_qty(osv.osv_memory):
 
         res_original = prod_obj_pool.browse(cr, uid, rec_id, context=context)
         for data in self.browse(cr, uid, ids, context=context):
-            inventory_id = inventry_obj.create(cr , uid, {'name': _('INV: ') + str(res_original.name)}, context=context)
+            inventory_id = inventry_obj.create(cr , uid, {'name': _('INV: ') + tools.ustr(res_original.name)}, context=context)
             line_data ={
                 'inventory_id' : inventory_id,
                 'product_qty' : data.new_quantity,