diff --git a/inc/WritableCollection.php b/inc/WritableCollection.php
index 68c78a3a..4c5f6efa 100644
--- a/inc/WritableCollection.php
+++ b/inc/WritableCollection.php
@@ -52,7 +52,7 @@ class WritableCollection extends DAVResource {
       $resource_type = $first->GetType();
     }
   
-    $uid = $first->GetPValue('UID');
+    $uid = $vcal->GetUID();
     if ( empty($segment_name) ) {
       $segment_name = $uid.'.ics';
     }