diff --git a/addons/calendar/models/calendar_filter.py b/addons/calendar/models/calendar_filter.py
index 62779e89641..d18a6b4c65d 100644
--- a/addons/calendar/models/calendar_filter.py
+++ b/addons/calendar/models/calendar_filter.py
@@ -8,7 +8,7 @@ class Contacts(models.Model):
     _name = 'calendar.filters'
     _description = 'Calendar Filters'
 
-    user_id = fields.Many2one('res.users', 'Me', required=True, default=lambda self: self.env.user, index=True)
+    user_id = fields.Many2one('res.users', 'Me', required=True, default=lambda self: self.env.user, index=True, ondelete='cascade')
     partner_id = fields.Many2one('res.partner', 'Employee', required=True, index=True)
     active = fields.Boolean('Active', default=True)
     partner_checked = fields.Boolean('Checked', default=True)  # used to know if the partner is checked in the filter of the calendar view for the user_id.
diff --git a/addons/hr_work_entry/models/hr_work_entry.py b/addons/hr_work_entry/models/hr_work_entry.py
index c249ae57178..037dcb203d9 100644
--- a/addons/hr_work_entry/models/hr_work_entry.py
+++ b/addons/hr_work_entry/models/hr_work_entry.py
@@ -260,7 +260,7 @@ class Contacts(models.Model):
     _name = 'hr.user.work.entry.employee'
     _description = 'Work Entries Employees'
 
-    user_id = fields.Many2one('res.users', 'Me', required=True, default=lambda self: self.env.user)
+    user_id = fields.Many2one('res.users', 'Me', required=True, default=lambda self: self.env.user, ondelete='cascade')
     employee_id = fields.Many2one('hr.employee', 'Employee', required=True)
     active = fields.Boolean('Active', default=True)