ipcclean in 8.1 broken?

I just tried using ipcclean in 8.1.3.  It doesn't work when I su to the 
pgsql user.  This part of the script:

if [ "$USER" = 'root' -o "$LOGNAME" = 'root' ]

Always fails because even tho $USER is set to 'pgsql' when su'ed, 
$LOGNAME is still root.

This is on FreeBSD 4.9

Chris