what to do with corrupt /var/db/portsnap directory?

[Ronald Klop]

Hi,

I have a computer which crashed and fsck removed some files in  
/var/db/portsnap/files. If I run portsnap I get this error now.

/usr/ports/devel/elixir-combine/
files/d542ae5f0048c430905d5f8de805dc81db255b5fe8aa35d2d63569c76086e902.gz  
not found -- snapshot corrupt.

Is there a way to let portsnap fix the corrupted state without removing  
/var/db/portsnap/files and re-downloading everything?

Regards,
Ronald.