diff --git a/inc/DAVPrincipal.php b/inc/DAVPrincipal.php
index 694df9c6..f8dae8b7 100644
--- a/inc/DAVPrincipal.php
+++ b/inc/DAVPrincipal.php
@@ -499,6 +499,10 @@ class DAVPrincipal extends Principal
         $reply->CalDAVElement($prop, 'schedule-outbox-URL', $reply->href($this->url('schedule-outbox')) );
         break;
 
+      case 'urn:ietf:params:xml:ns:caldav:schedule-default-calendar-URL':
+        $reply->CalDAVElement($prop, 'schedule-default-calendar-URL', $reply->href($this->url('schedule-default-calendar')) );
+        break;
+
       case 'http://calendarserver.org/ns/:dropbox-home-URL':
         $reply->CalendarserverElement($prop, 'dropbox-home-URL', $reply->href($this->url('dropbox')) );
         break;
diff --git a/inc/Principal.php b/inc/Principal.php
index 304f44b1..65834f4d 100644
--- a/inc/Principal.php
+++ b/inc/Principal.php
@@ -371,6 +371,8 @@ class Principal {
   * @return string The principal-URL
   */
   public function url($type = 'principal', $internal=false ) {
+    global $c;
+    
     if ( $internal )
       $result = $this->dav_name();
     else {
@@ -382,6 +384,7 @@ class Principal {
 
     switch( $type ) {
       case 'principal':          break;
+      case 'schedule-default-calendar':  $result .= $c->home_calendar_name; break;
       case 'schedule-inbox':     $result .= '.in/';        break;
       case 'schedule-outbox':    $result .= '.out/';       break;
       case 'dropbox':            $result .= '.drop/';      break;