diff --git a/lib/weblib.php b/lib/weblib.php
index 559145f148f..867ae1330e0 100644
--- a/lib/weblib.php
+++ b/lib/weblib.php
@@ -85,7 +85,7 @@ se><selector><annotation><semantics><annotation-xml><tt><code>';
  * Allowed protocols - array of protocols that are safe to use in links and so on
  * @global string $ALLOWED_PROTOCOLS
  */
-$ALLOWED_PROTOCOLS = array('http', 'https', 'ftp', 'news', 'mailto', 'rtsp', 'teamspeak', 'gopher', 
+$ALLOWED_PROTOCOLS = array('http', 'https', 'ftp', 'news', 'mailto', 'rtsp', 'teamspeak', 'gopher', 'mms',
                            'color', 'callto', 'cursor', 'text-align', 'font-size', 'font-weight', 'font-style', 
                            'border', 'margin', 'padding');   // CSS as well to get through kses