Upstart node.js working directory

Starting Node.js with Upstart, when trying to access files within Node.js it cannot access them without using the full path. I need it to use the working directory.

start on startup
stop on shutdown

script
        echo $$ > /var/run/mynodeapp.pid
        exec sudo -u mynodeapp node server.js >> /var/log/mynodeapp.sys.log 2>&1
end script

pre-start script
        echo "Starting" >> /var/log/mynodeapp.sys.log
end script

pre-stop script
        rm /var/run/mynodeapp.pid
        echo "Stopping" >> /var/log/mynodeapp.sys.log
end script