diff --git a/addons/stock/wizard/stock_change_product_qty.py b/addons/stock/wizard/stock_change_product_qty.py
index 49ccc90a26a..f93cd9b8dbc 100644
--- a/addons/stock/wizard/stock_change_product_qty.py
+++ b/addons/stock/wizard/stock_change_product_qty.py
@@ -21,6 +21,7 @@
 
 from osv import fields, osv
 from tools.translate import _
+import tools
 
 class stock_change_product_qty(osv.osv_memory):
     _name = "stock.change.product.qty"