diff --git a/addons/hr_expense/hr_expense.py b/addons/hr_expense/hr_expense.py
index f3d5f9657cb..8b126423565 100644
--- a/addons/hr_expense/hr_expense.py
+++ b/addons/hr_expense/hr_expense.py
@@ -193,9 +193,6 @@ class hr_expense_expense(osv.osv):
                     account_journal.write(cr, uid, [journal.id],{'analytic_journal_id':analytic_journal_ids[0]})
             inv_id = invoice_obj.create(cr, uid, inv, {'type': 'in_invoice'})
             invoice_obj.button_compute(cr, uid, [inv_id], {'type': 'in_invoice'}, set_total=True)
-            wf_service = netsvc.LocalService("workflow")
-            wf_service.trg_validate(uid, 'account.invoice', inv_id, 'invoice_open', cr)
-
             self.write(cr, uid, [exp.id], {'invoice_id': inv_id, 'state': 'invoiced'})
             res = inv_id
         return res