diff --git a/hr_holidays_timeoff_analysis/__manifest__.py b/hr_holidays_timeoff_analysis/__manifest__.py
index 9cc2513..cca8a91 100644
--- a/hr_holidays_timeoff_analysis/__manifest__.py
+++ b/hr_holidays_timeoff_analysis/__manifest__.py
@@ -3,7 +3,7 @@
 
 {
     "name": "hr_holidays_timeoff_analysis",
-    "version": "18.0.1.0.0",
+    "version": "18.0.1.1.0",
     "author": "Elabore",
     "website": "https://git.elabore.coop/elabore/elabore-addons",
     "maintainer": "Elabore",
diff --git a/hr_holidays_timeoff_analysis/models/hr_leave_timeoff_day.py b/hr_holidays_timeoff_analysis/models/hr_leave_timeoff_day.py
index 29f88ca..d2fca51 100644
--- a/hr_holidays_timeoff_analysis/models/hr_leave_timeoff_day.py
+++ b/hr_holidays_timeoff_analysis/models/hr_leave_timeoff_day.py
@@ -18,12 +18,12 @@ class TimeOffDay(models.Model):
     hr_leave_type = fields.Many2one(related="hr_leave_id.holiday_status_id")
     leave_duration_by_day = fields.Float()
 
-    def employee_is_scheduled_to_work_this_day(self, date, employee, leave):
+    def employee_is_scheduled_to_work_this_day(self, date, employee, leave=None):
         """
         Check if the employee is scheduled to work on this day according to his
         calendar.
         """
-        calendar = self.get_calendar(employee, date)
+        calendar = self._get_calendar_for_leave(employee, date, leave)
         if not calendar or not calendar.attendance_ids:
             return False
         day_of_week = str(date.weekday())
@@ -41,7 +41,19 @@ class TimeOffDay(models.Model):
             )
         return bool(attendances)
 
-    def get_calendar(self, employee, date, leave=None):
+    def _get_calendar_for_leave(self, employee, date, leave=None):
+        """
+        Return the calendar to use to know whether ``employee`` works on
+        ``date`` for a given ``leave``.
+
+        The base implementation ignores ``leave`` and returns the employee's
+        regular working calendar. It is an extension point: the module
+        ``hr_holidays_timeoff_analysis_l10n_fr_hr_holidays`` overrides it to
+        force the company calendar for French reference leaves.
+        """
+        return self.get_calendar(employee, date)
+
+    def get_calendar(self, employee, date):
         """
         Get the working time calendar of the employee.
         """