diff --git a/addons/account/invoice.py b/addons/account/invoice.py
index 96f3a0afb40..ae9428f19db 100644
--- a/addons/account/invoice.py
+++ b/addons/account/invoice.py
@@ -24,8 +24,6 @@ import netsvc
 from osv import fields, osv
 import ir
 import pooler
-import mx.DateTime
-from mx.DateTime import RelativeDateTime
 from tools import config
 from tools.translate import _