diff --git a/addons/resource/i18n/resource.pot b/addons/resource/i18n/resource.pot
index 7d120650736..c7646ec2873 100644
--- a/addons/resource/i18n/resource.pot
+++ b/addons/resource/i18n/resource.pot
@@ -258,6 +258,12 @@ msgstr ""
 #. odoo-python
 #: code:addons/resource/models/resource.py:0
 #, python-format
+msgid "Impossible to switch calendar type for the default company schedule."
+msgstr ""
+
+#. module: resource
+#: code:addons/resource/models/resource.py:0
+#, python-format
 msgid ""
 "In a calendar with 2 weeks mode, all periods need to be in the sections."
 msgstr ""
diff --git a/addons/resource/models/resource_calendar.py b/addons/resource/models/resource_calendar.py
index 16fcfee5068..7627d9fc0b5 100644
--- a/addons/resource/models/resource_calendar.py
+++ b/addons/resource/models/resource_calendar.py
@@ -14,7 +14,7 @@ from pytz import timezone, utc
 
 from odoo import api, fields, models, _
 from odoo.addons.base.models.res_partner import _tz_get
-from odoo.exceptions import ValidationError
+from odoo.exceptions import ValidationError, UserError
 from odoo.osv import expression
 from odoo.tools.float_utils import float_round
 
@@ -184,6 +184,9 @@ class ResourceCalendar(models.Model):
         return float_round(hour_count / float(number_of_days), precision_digits=2)
 
     def switch_calendar_type(self):
+        if self == self.env.company.resource_calendar_id:
+            raise UserError(_('Impossible to switch calendar type for the default company schedule.'))
+
         if not self.two_weeks_calendar:
             self.attendance_ids.unlink()
             self.attendance_ids = [