diff --git a/packing.py b/packing.py
index 3203dd7a01..857a95cf0d 100644
--- a/packing.py
+++ b/packing.py
@@ -1,5 +1,5 @@
 "Packing"
-from trytond.osv import fields, OSV
+from trytond.osv import fields, OSV, ExceptORM
 from trytond.wizard import Wizard, WizardOSV
 import time
 from trytond.netsvc import LocalService