diff --git a/addons/google_calendar/google_calendar.py b/addons/google_calendar/google_calendar.py
index 9a5a43c551c..f443f9b2904 100644
--- a/addons/google_calendar/google_calendar.py
+++ b/addons/google_calendar/google_calendar.py
@@ -423,7 +423,7 @@ class google_calendar(osv.AbstractModel):
                 if type == "write":
                     for oe_attendee in event['attendee_ids']:
                         if oe_attendee.email == google_attendee['email']:
-                            calendar_attendee_obj.write(cr, uid, [oe_attendee.id], {'state': google_attendee['responseStatus']}, context=context)
+                            calendar_attendee_obj.write(cr, uid, [oe_attendee.id], {'state': google_attendee['responseStatus'], 'google_internal_event_id': single_event_dict.get('id')}, context=context)
                             google_attendee['found'] = True
                             continue
 
@@ -442,6 +442,7 @@ class google_calendar(osv.AbstractModel):
                 partner_record.append((4, attendee.get('id')))
                 attendee['partner_id'] = attendee.pop('id')
                 attendee['state'] = google_attendee['responseStatus']
+                attendee['google_internal_event_id'] = single_event_dict.get('id')
                 attendee_record.append((0, 0, attendee))
         for google_alarm in single_event_dict.get('reminders', {}).get('overrides', []):
             alarm_id = calendar_alarm_obj.search(
@@ -626,7 +627,7 @@ class google_calendar(osv.AbstractModel):
                     update_date = datetime.strptime(response['updated'], "%Y-%m-%dT%H:%M:%S.%fz")
                     ev_obj.write(cr, uid, att.event_id.id, {'oe_update_date': update_date})
                     new_ids.append(response['id'])
-                    att_obj.write(cr, uid, [att.id], {'google_internal_event_id': response['id'], 'oe_synchro_date': update_date})
+                    att_obj.write(cr, uid, [att.id for att in att.event_id.attendee_ids], {'google_internal_event_id': response['id'], 'oe_synchro_date': update_date})
                     cr.commit()
                 else:
                     _logger.warning("Impossible to create event %s. [%s]" % (att.event_id.id, st))