Root prompt seems to ignore a default mark

Created by: iainhallam

Shell: bash Operating system: Debian Jessie Liquid Prompt version: 1.11

I've been experimenting with LP as root, and tried to set a default mark as I would for a user account, which works fine, but as root I keep getting the # mark. I've set it in .config/liduidpromptrc, and can see the resulting variable in my environment:

set | grep ^LP_MARK_DEFAULT LP_MARK_DEFAULT='>'

However:

set | grep ^LP_MARK= LP_MARK=$'\$\[\E(B\E[m\] '

Do I need to enable something extra as root to get the default mark to be respected?