Wrong command missing php in crontab?

0.4alpha6, Ubuntu

Subject: Cron <aegir@localhost> /var/aegir/drush/drush.php hosting-dispatch --root='/var/aegir/h
ostmaster-0.4-alpha6' --uri='http://vps.bmannconsulting.com'
Content-Type: text/plain; charset=ANSI_X3.4-1968
X-Cron-Env: <SHELL=/bin/bash>
X-Cron-Env: <PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games>
X-Cron-Env: <HOME=/var/aegir>
X-Cron-Env: <LOGNAME=aegir>
Message-Id: <20100311031401.30EE765CA@localhost>
Date: Thu, 11 Mar 2010 03:14:01 +0000 (UTC)

Drush command could not be completed.                                    [error]

I'm getting these errors sent to my aegir user. Looking at it, it seems to be missing a "php" at the beginning of the command? It runs correctly when run directly in the shell with a php in front.