diff --git a/lib/htmlpurifier/HTMLPurifier/AttrDef/URI/Email.php b/lib/htmlpurifier/HTMLPurifier/AttrDef/URI/Email.php
index ababd9eae07..31c3add51ce 100644
--- a/lib/htmlpurifier/HTMLPurifier/AttrDef/URI/Email.php
+++ b/lib/htmlpurifier/HTMLPurifier/AttrDef/URI/Email.php
@@ -15,4 +15,4 @@ class HTMLPurifier_AttrDef_URI_Email extends HTMLPurifier_AttrDef
 }
 
 // sub-implementations
-require_once 'HTMLPurifier/AttrDef/URI/Email/SimpleCheck.php';
+//moodlefix require_once 'HTMLPurifier/AttrDef/URI/Email/SimpleCheck.php';