pg_restore

Hi, I have a dump that was generated with pg_dump in 8.0-beta5 and I'm
trying to restore with pg_restore in 8.0-RC3.

The pg_dump command was: # pg_dump -Ft -o -b database
The pg_restore command was: # pg_restore -Ft -d database

When I execute pg_restore I get this error:
pg_restore: [archiver] unsupported version (1.13) in file header

Dumps created in beta5 are incompatible with rc3 ?
Any suggestion for how can I restore this dump ?

Thank for any help.
Cesar