Replace encoding detection with UTF-8 in CSS Compressor

CSS Compressor convert mess up hebrew text encoding and no email client can't read it.
mimemail_compress.inc line 68-74

if (function_exists('mb_detect_encoding') && function_exists('mb_convert_encoding')) {
      $encoding = mb_detect_encoding($body);
      if ($encoding) {
        $body = mb_convert_encoding($body, 'HTML-ENTITIES', $encoding);
        $doc->encoding = $encoding;
      }
    }

Original text:
כשדגכשדכג
Converted to:
›©“’›©“›’ 

mb_detect_encoding($body) returns "ISO-8859-8"
however the $body is in UTF-8

Tried the following

if (function_exists('mb_detect_encoding') && function_exists('mb_convert_encoding')) {
      $encoding = mb_detect_encoding($body);
      if ($encoding) {
        $body = mb_convert_encoding($body, 'HTML-ENTITIES', <strong>"UTF-8"</strong>);
        $doc->encoding = $encoding;
      }
    }

Works great, now its returning the good text.