I have tried to add the above line to my install of bbpress and I get the following error:
Fatal error: Cannot redeclare allowed_tags() (previously declared in /home/taacus/public_html/wordpress/wp-includes/general-template.php:602) in /home/taacus/public_html/wordpress/bbpress/bb-includes/template-functions.php on line 949
What am I doing wrong?