Openbox root autostart?

I want to run a script as root when the computer starts. This was earlier done in rc.local, but not anymore. What I've tried: - putting the script in /etc/profile.d - adding the /pathto/script.sh in /etc/profile - added /pathto/script.sh & in /etc/xdg/openbox/autostart The script is for setting things powertop recommends; the script works just fine when I run sudo /pathto/script.sh.