diff --git a/plugins/libkolab/lib/kolab_format_event.php b/plugins/libkolab/lib/kolab_format_event.php
index 0fda1e39..979b33b4 100644
--- a/plugins/libkolab/lib/kolab_format_event.php
+++ b/plugins/libkolab/lib/kolab_format_event.php
@@ -241,7 +241,6 @@ class kolab_format_event extends kolab_format_xcal
     private function compact_exception($exception, $master)
     {
         $forbidden = array('recurrence','organizer','_attachments');
-        $whitelist = array('start','end');
 
         foreach ($forbidden as $prop) {
             if (array_key_exists($prop, $exception)) {
@@ -249,12 +248,6 @@ class kolab_format_event extends kolab_format_xcal
             }
         }
 
-        foreach ($master as $prop => $value) {
-            if (isset($exception[$prop]) && gettype($exception[$prop]) == gettype($value) && $exception[$prop] == $value && !in_array($prop, $whitelist)) {
-                unset($exception[$prop]);
-            }
-        }
-
         // preserve this property for date serialization
         $exception['allday'] = $master['allday'];