hostaddr field missing from dump-utmp output

Binary package hint: acct

dump-utmp's man page says that its output fields are "user name, tty, type, id, pid, hostaddr, host, time", separated by '|'. Indeed, in lucid, a sample record of 'dump-utmp /var/log/wtmp' looks like this(spaces omitted):

foo|pts/1|7|ts/1|2055|10.0.0.130|foohost.local|Mon Nov 1 09:45:20 2010

(this is with:
$ apt-cache policy acct
acct:
  Installed: 6.5.1-1ubuntu1
  Candidate: 6.5.1-1ubuntu1
  Version table:
 *** 6.5.1-1ubuntu1 0
        500 http://fi.archive.ubuntu.com/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status
$ lsb_release -rd
Description: Ubuntu 10.04.1 LTS
Release: 10.04)

In maverick, however, the output of the same command is missing the 6th field! (No changes in the man page)

foo|pts/2|7|ts/2|24657|foohost.local|Tue Nov 2 12:12:57 2010

(with:
$ apt-cache policy acct
acct:
  Installed: 6.5.4-2ubuntu1
  Candidate: 6.5.4-2ubuntu1
  Version table:
 *** 6.5.4-2ubuntu1 0
        500 http://ubuntu.mirror.tudos.de/ubuntu/ maverick/main i386 Packages
        100 /var/lib/dpkg/status
$ lsb_release -rd
Description: Ubuntu 10.10
Release: 10.10
)