This is an upstream bug fixed in 3.3.6 (see http://archives.zmanda.com/amanda-archives/viewtopic.php?t=7322&sid=aa51 6467b5baa942a8b4f34dda49eefd).
According to the author this is fixed by the following commit: https://github.com/zmanda/amanda/commit/aaae124a5a8819fcdc0136cfb6ad3531 18c2fc4c -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org