diff --git a/addons/hr_holidays/models/hr_employee.py b/addons/hr_holidays/models/hr_employee.py
index 155fc472ad3..d869c42ce36 100644
--- a/addons/hr_holidays/models/hr_employee.py
+++ b/addons/hr_holidays/models/hr_employee.py
@@ -124,7 +124,7 @@ class HrEmployeeBase(models.AbstractModel):
         super(HrEmployeeBase, self)._onchange_parent_id()
         previous_manager = self._origin.parent_id.user_id
         manager = self.parent_id.user_id
-        if manager and self.leave_manager_id == previous_manager:
+        if manager and self.leave_manager_id == previous_manager or not self.leave_manager_id:
             self.leave_manager_id = manager
 
     def _compute_show_leaves(self):