diff --git a/phpgwapi/inc/htmlpurifier/library/HTMLPurifier/PercentEncoder.php b/phpgwapi/inc/htmlpurifier/library/HTMLPurifier/PercentEncoder.php
index 164b9bd83d..44ca77c369 100755
--- a/phpgwapi/inc/htmlpurifier/library/HTMLPurifier/PercentEncoder.php
+++ b/phpgwapi/inc/htmlpurifier/library/HTMLPurifier/PercentEncoder.php
@@ -51,8 +51,8 @@ class HTMLPurifier_PercentEncoder
         $ret = '';
         //error_log(__METHOD__.__LINE__.$string);
         for ($i = 0, $c = strlen($string); $i < $c; $i++) {
-            if (substr($string,$i,1) !== '%' && !isset($this->preserve[$int = ord(substr($string,$i,1))]) ) {
-                $ret .= rawurlencode(substr($string,$i,1)); // '%' . sprintf('%02X', $int);
+            if (($chr=substr($string,$i,1)) !== '%' && !isset($this->preserve[$int = ord($chr)])) {
+                $ret .= rawurlencode($chr); // '%' . sprintf('%02X', $int);
             } else {
                 $ret .= substr($string,$i,1);
             }