diff --git a/addons/hr_attendance/models/hr_employee.py b/addons/hr_attendance/models/hr_employee.py
index a17c2e50b84..a4dac9883ea 100644
--- a/addons/hr_attendance/models/hr_employee.py
+++ b/addons/hr_attendance/models/hr_employee.py
@@ -74,7 +74,7 @@ class HrEmployee(models.Model):
     @api.multi
     def attendance_manual(self, next_action, entered_pin=None):
         self.ensure_one()
-        if entered_pin or self.env['res.users'].browse(SUPERUSER_ID).has_group('hr_attendance.group_hr_attendance_use_pin') and (self.user_id and self.user_id.id != self._uid or not self.user_id):
+        if not (entered_pin is None) or self.env['res.users'].browse(SUPERUSER_ID).has_group('hr_attendance.group_hr_attendance_use_pin') and (self.user_id and self.user_id.id != self._uid or not self.user_id):
             if entered_pin != self.pin:
                 return {'warning': _('Wrong PIN')}
         return self.attendance_action(next_action)