diff --git a/addons/hr_holidays/models/hr_leave.py b/addons/hr_holidays/models/hr_leave.py
index 25bf85e595d..0ad2618177b 100644
--- a/addons/hr_holidays/models/hr_leave.py
+++ b/addons/hr_holidays/models/hr_leave.py
@@ -891,6 +891,10 @@ class HolidaysRequest(models.Model):
         if self.filtered(lambda holiday: holiday.state != 'draft'):
             raise UserError(_('Time off request must be in Draft state ("To Submit") in order to confirm it.'))
         self.write({'state': 'confirm'})
+        holidays = self.filtered(lambda leave: leave.validation_type == 'no_validation')
+        if holidays:
+            # Automatic validation should be done in sudo, because user might not have the rights to do it by himself
+            holidays.sudo().action_validate()
         self.activity_update()
         return True