diff --git a/addons/hr_holidays/models/hr_holidays.py b/addons/hr_holidays/models/hr_holidays.py
index 77ac17b5760..9b4daa0f5bf 100644
--- a/addons/hr_holidays/models/hr_holidays.py
+++ b/addons/hr_holidays/models/hr_holidays.py
@@ -284,7 +284,7 @@ class Holidays(models.Model):
 
         if employee_id:
             employee = self.env['hr.employee'].browse(employee_id)
-            resource = employee.resource_id
+            resource = employee.resource_id.sudo()
             if resource and resource.calendar_id:
                 hours = resource.calendar_id.get_working_hours(from_dt, to_dt, resource_id=resource.id, compute_leaves=True)
                 uom_hour = resource.calendar_id.uom_id