diff --git a/plugins/calendar/calendar_ui.js b/plugins/calendar/calendar_ui.js
index 5f79cac5..fe11420c 100644
--- a/plugins/calendar/calendar_ui.js
+++ b/plugins/calendar/calendar_ui.js
@@ -2410,6 +2410,17 @@ function rcube_calendar_ui(settings)
         event.temp = true;
         event.className = 'fc-event-cal-'+data.calendar+' fc-event-temp';
         fc.fullCalendar(data.id ? 'updateEvent' : 'renderEvent', event);
+
+        // mark all recurring instances as temp
+        if (event.recurrence || event.recurrence_id) {
+          var base_id = event.recurrence_id ? event.recurrence_id.replace(/-\d+$/, '') : event.id;
+          $.each(fc.fullCalendar('clientEvents', function(e){ return e.id == base_id || e.recurrence_id == base_id; }), function(i,ev) {
+            ev.temp = true;
+            ev.editable = false;
+            event.className += ' fc-event-temp';
+            fc.fullCalendar('updateEvent', ev);
+          });
+        }
       }
     };