How to use the gzip format for access_log in the new 1.3.10?

[Lorenzo Raffio]

Guys I updated from nginx 1.3.9 to 1.3.10, edited my access_log line and
here it is now:
*access_log /var/www/blahblah/logs/access.log gzip buffer=32k;*

Unfortunately when I restart nginx I get this error:
nginx: [emerg] unknown log format "gzip"

What am I doing wrong?

Thanks in advance.
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