diff --git a/addons/calendar/models/calendar.py b/addons/calendar/models/calendar.py
index 957bb1bdc61..7f257e3d19f 100644
--- a/addons/calendar/models/calendar.py
+++ b/addons/calendar/models/calendar.py
@@ -243,7 +243,7 @@ class AlarmManager(models.AbstractModel):
     _name = 'calendar.alarm_manager'
     _description = 'Event Alarm Manager'
 
-    def get_next_potential_limit_alarm(self, alarm_type, seconds=None, partner_id=None):
+    def _get_next_potential_limit_alarm(self, alarm_type, seconds=None, partner_id=None):
         result = {}
         delta_request = """
             SELECT
@@ -374,7 +374,7 @@ class AlarmManager(models.AbstractModel):
 
         cron_interval = cron.interval_number * interval_to_second[cron.interval_type]
 
-        all_meetings = self.get_next_potential_limit_alarm('email', seconds=cron_interval)
+        all_meetings = self._get_next_potential_limit_alarm('email', seconds=cron_interval)
 
         for meeting in self.env['calendar.event'].browse(all_meetings):
             max_delta = all_meetings[meeting.id]['max_duration']
@@ -404,7 +404,7 @@ class AlarmManager(models.AbstractModel):
         if not partner:
             return []
 
-        all_meetings = self.get_next_potential_limit_alarm('notification', partner_id=partner.id)
+        all_meetings = self._get_next_potential_limit_alarm('notification', partner_id=partner.id)
         time_limit = 3600 * 24  # return alarms of the next 24 hours
         for event_id in all_meetings:
             max_delta = all_meetings[event_id]['max_duration']
diff --git a/addons/calendar_sms/models/calendar.py b/addons/calendar_sms/models/calendar.py
index 1f87174e150..65cd1a8cad5 100644
--- a/addons/calendar_sms/models/calendar.py
+++ b/addons/calendar_sms/models/calendar.py
@@ -52,7 +52,7 @@ class AlarmManager(models.AbstractModel):
         }
 
         cron_interval = cron.interval_number * interval_to_second[cron.interval_type]
-        events_data = self.get_next_potential_limit_alarm('sms', seconds=cron_interval)
+        events_data = self._get_next_potential_limit_alarm('sms', seconds=cron_interval)
 
         for event in self.env['calendar.event'].browse(events_data):
             max_delta = events_data[event.id]['max_duration']