diff --git a/addons/hr/models/hr_employee.py b/addons/hr/models/hr_employee.py
index 06aac151553..b22e8343d64 100644
--- a/addons/hr/models/hr_employee.py
+++ b/addons/hr/models/hr_employee.py
@@ -210,7 +210,7 @@ class HrEmployeePrivate(models.Model):
             responsible_user_id = employee.parent_id.user_id.id
             if responsible_user_id:
                 employees_scheduled |= employee
-                lang = self.env['res.partner'].browse(responsible_user_id).lang
+                lang = self.env['res.users'].browse(responsible_user_id).lang
                 formated_date = format_date(employee.env, employee.work_permit_expiration_date, date_format="dd MMMM y", lang_code=lang)
                 employee.activity_schedule(
                     'mail.mail_activity_data_todo',