diff --git a/addons/hr_timesheet_invoice/hr_timesheet_invoice.py b/addons/hr_timesheet_invoice/hr_timesheet_invoice.py
index 9baaf5b1b7f..22f21776c0d 100644
--- a/addons/hr_timesheet_invoice/hr_timesheet_invoice.py
+++ b/addons/hr_timesheet_invoice/hr_timesheet_invoice.py
@@ -135,7 +135,7 @@ class account_analytic_line(osv.osv):
     def _default_general_account(self, cr, uid, context=None):
         proxy = self.pool.get('hr.employee')
         record_ids = proxy.search(cr, uid, [('user_id', '=', uid)], context=context)
-        if not len(record_ids):
+        if not record_ids:
             raise osv.except_osv(_('Error!'), _('Please create an employee and associate it with this user.'))
         employee = proxy.browse(cr, uid, record_ids[0], context=context)
         if employee.product_id and employee.product_id.property_account_income: