How to set path for the EDITOR variable?

For some reason something has changing in my AIX environment where when I type:

ACLEDIT filename

...I get:

3002-104 acledit: EDITOR environment variable must be full pathname

I know I need to reset the EDITOR variables path to /usr/bin/vi but I can't remember the syntax anyone?

On (ba)sh/ksh, you can use

export EDITOR=/usr/bin/vi

On csh it would be

setenv EDITOR /usr/bin/vi

Worked like a charm, I couldn't remember the command no matter what I did....