diff --git a/include/class.format.php b/include/class.format.php
index 8bdb7fa46fdd8676c24887a7d49706f36219d9eb..03216e4a061665b2b18a856f8bf95509f9dd5236 100644
--- a/include/class.format.php
+++ b/include/class.format.php
@@ -202,8 +202,9 @@ class Format {
array(':<(head|style|script).+</\1>:is', # <head> and <style> sections
':<!\[[^]<]+\]>:', # <![if !mso]> and friends
':<!DOCTYPE[^>]+>:', # <!DOCTYPE ... >
+ ':<\?[^>]+>:', # <?xml version="1.0" ... >
),
- array('', '', ''),
+ array('', '', '', ''),
$html);
$config = array(
'safe' => 1, //Exclude applet, embed, iframe, object and script tags.