diff --git a/include/htmLawed.php b/include/htmLawed.php
index 6d25f1f98a714269c3b65d87ca6f3dcb5db96dcb..9d0cc9e95e8210746f52933e0615eb2df29a7275 100644
--- a/include/htmLawed.php
+++ b/include/htmLawed.php
@@ -644,7 +644,7 @@ return '';
 function hl_tidy($t, $w, $p){
 // Tidy/compact HTM
 if(strpos(' pre,script,textarea', "$p,")){return $t;}
-$t = preg_replace('`\s+`', ' ', preg_replace_callback(array('`(<(!\[CDATA\[))(.+?)(\]\]>)`sm', '`(<(!--))(.+?)(-->)`sm', '`(<(pre|script|textarea)[^>]*?>)(.+?)(</\2>)`sm'), create_function('$m', 'return $m[1]. str_replace(array("<", ">", "\n", "\r", "\t", " "), array("\x01", "\x02", "\x03", "\x04", "\x05", "\x07"), $m[3]). $m[4];'), $t));
+$t = preg_replace('`[ \t\r\n\f]+`', ' ', preg_replace_callback(array('`(<(!\[CDATA\[))(.+?)(\]\]>)`sm', '`(<(!--))(.+?)(-->)`sm', '`(<(pre|script|textarea)[^>]*?>)(.+?)(</\2>)`sm'), create_function('$m', 'return $m[1]. str_replace(array("<", ">", "\n", "\r", "\t", " "), array("\x01", "\x02", "\x03", "\x04", "\x05", "\x07"), $m[3]). $m[4];'), $t));
 if(($w = strtolower($w)) == -1){
  return str_replace(array("\x01", "\x02", "\x03", "\x04", "\x05", "\x07"), array('<', '>', "\n", "\r", "\t", ' '), $t);
 }