compact backup: Interruption during --rebuild-indexes will make backup invalid

- I create valid backup of sysbench database with --compact option
> innobackupex --ibbackup=./xtrabackup_55 --compact <...>
...
130313 01:56:37 innobackupex: completed OK!

- I start rebuild indexes
> innobackupex --ibbackup=./xtrabackup_55 --apply-log --rebuild-indexes <...>
....
Starting to expand compacted .ibd files.
130313 1:56:55 InnoDB: Warning: allocated tablespace 13, old maximum was 9
Expanding ./sbtest4t1M/sbtest4.ibd
Expanding ./sbtest4t1M/sbtest3.ibd
Expanding ./sbtest4t1M/sbtest1.ibd
...

- I press Ctrl-C
Preparation of backup is interrupted

- I try to continue rebuild indexes but it failed
> innobackupex --ibbackup=./xtrabackup_55 --apply-log --rebuild-indexes <...>
...
Starting to expand compacted .ibd files.
130313 1:57:06 InnoDB: Warning: allocated tablespace 13, old maximum was 9
Not expanding ./sbtest4t1M/sbtest4.ibd
innobackupex: Error:
innobackupex: ibbackup failed at innobackupex line 366.

ls -l <datadir>/sbtest4t1M/*
-rw-rw---- 1 root root 65 Mar 12 06:51 db.opt
-rw-rw---- 1 root root 8632 Mar 12 06:51 sbtest1.frm
-rw-r----- 1 root root 231571456 Mar 13 01:56 sbtest1.ibd
-rw-r----- 1 root root 184 Mar 13 01:56 sbtest1.ibd.pmap
-rw-r----- 1 root root 80740352 Mar 13 01:56 sbtest1.ibd.tmp
-rw-rw---- 1 root root 8632 Mar 12 06:52 sbtest2.frm
-rw-r----- 1 root root 231653376 Mar 13 01:56 sbtest2.ibd
-rw-r----- 1 root root 184 Mar 13 01:56 sbtest2.ibd.pmap
-rw-rw---- 1 root root 8632 Mar 12 06:52 sbtest3.frm
-rw-r----- 1 root root 255852544 Mar 13 01:56 sbtest3.ibd
-rw-rw---- 1 root root 8632 Mar 12 06:52 sbtest4.frm
-rw-r----- 1 root root 255852544 Mar 13 01:56 sbtest4.ibd