How to reset sequences on pre-7.1

Hi,

I usually use a:

SELECT setval('seq_name', NULL);

to reset sequences, so the next time it's called it returns '1'. This
works in all Pg releases I've ever tested but 7.0.

On an hosted space that still has a 7.0 release candidate, this query
fails, telling me that I cannot use a 0 value.

Anybody knows how to reset sequences in this case?

Regards
--
Matteo Beccati
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