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vipw and vigr default editor

When I run

sudo vipw or sudo vigr, it uses nano as the default editor. I've already used update-alternatives to select vim as my default editor, but this doesn't seem to work for vipw/vigr.

I have to do

sudo EDITOR=vim vipw

How can I make vim the default editor for vipw/vigr. Or how can I set the EDITOR variable when I use sudo automatically?