Comment 13 for bug 349072

Oh, I see. I'll try to remember to only set it for the "rdiff-backup" line and not the "rdiff-backup (Ubuntu)" line.

If you want to backport the fix to your package, here's the patch:
http://lists.nongnu.org/archive/html/rdiff-backup-commits/2009-03/msg00023.html

I can't say when the next release of rdiff-backup will be. It partly depends on whether the 'bad index order' bug which has recently been discussed on the mailing list looks like something I can tackle in a short timeframe.