diff --git a/inc/CalDAVPrincipal.php b/inc/CalDAVPrincipal.php
index 69cb1d2d..1e1ee89f 100644
--- a/inc/CalDAVPrincipal.php
+++ b/inc/CalDAVPrincipal.php
@@ -411,6 +411,7 @@ class CalDAVPrincipal
   * Return the privileges bits for the current session user to this resource
   */
   function Privileges() {
+    if ( is_string($this->privileges) ) $this->privileges = bindec( $this->privileges );
     return $this->privileges;
   }