diff --git a/addons/hr_timesheet_sheet/hr_timesheet_sheet.py b/addons/hr_timesheet_sheet/hr_timesheet_sheet.py
index 089ade7c618..75ca07861fb 100644
--- a/addons/hr_timesheet_sheet/hr_timesheet_sheet.py
+++ b/addons/hr_timesheet_sheet/hr_timesheet_sheet.py
@@ -294,7 +294,7 @@ class hr_timesheet_sheet(osv.osv):
         if r=='month':
             return time.strftime('%Y-%m-01')
         elif r=='week':
-            return (datetime.today() + relativedelta(weekday=0, weeks=-1)).strftime('%Y-%m-%d')
+            return (datetime.today() + relativedelta(weekday=0, days=-6)).strftime('%Y-%m-%d')
         elif r=='year':
             return time.strftime('%Y-01-01')
         return time.strftime('%Y-%m-%d')