$confstr = $this->getOption( 'math' );
$confstr .= '!' . $this->getOption( 'stubthreshold' );
$confstr .= '!' . $this->getOption( 'date' );
- $confstr .= '!' . $this->getOption( 'numberheadings' );
+ $confstr .= '!' . ($this->getOption( 'numberheadings' ) ? '1' : '');
$confstr .= '!' . $this->getOption( 'language' );
$confstr .= '!' . $this->getOption( 'thumbsize' );
// add in language specific options, if any