[sudo-users] sudo -s giving login shell

[Pierre-Yves Ritschard]

hi

I'm using sudo version 1.6.8p6 on the latest openbsd snapshot.
I'm using the ksh shell and the system wide config is stored in 
/etc/profile.

Users here are accustommed to using sudo -s to get a root shell.
But it doesn't load the /etc/profile as sudo doesn't load a login shell.
sudo ksh -l works fine but I'm wondering if there is a way of making 
sudo -s start a login shell.

Thanks for your time.