diff --git a/addons/hr_timesheet_invoice/report/report_analytic.py b/addons/hr_timesheet_invoice/report/report_analytic.py
index 02d164dd884..d6f66eeef48 100644
--- a/addons/hr_timesheet_invoice/report/report_analytic.py
+++ b/addons/hr_timesheet_invoice/report/report_analytic.py
@@ -101,7 +101,7 @@ class report_account_analytic_line_to_invoice(osv.osv):
                 WHERE
                     (invoice_id IS NULL) and (to_invoice IS NOT NULL)
                 GROUP BY
-                    to_char(l.date, 'YYYY'), to_char(l.date,'MM'), product_id, product_uom_id, account_id
+                    to_char(l.date, 'YYYY'), to_char(l.date,'MM'), l.product_id, l.product_uom_id, l.account_id
             )
         """)