diff --git a/actions/sitenoticeadminpanel.php b/actions/sitenoticeadminpanel.php
index 72c9f9a128..a0a8b03b64 100644
--- a/actions/sitenoticeadminpanel.php
+++ b/actions/sitenoticeadminpanel.php
@@ -110,9 +110,7 @@ class SitenoticeadminpanelAction extends AdminPanelAction
         }
 
         // scrub HTML input
-        require_once INSTALLDIR.'/extlib/HTMLPurifier/HTMLPurifier.auto.php';
-        $purifier = new HTMLPurifier();
-        $siteNotice = $purifier->purify($siteNotice);
+        $siteNotice = common_purify($siteNotice);
     }
 }