Clean OpenBSD's httpd logs

[C. L. Martinez]

Hi all,
 
 Sorry if this question sounds stupid, but how can I avoid this type of entry 
in OpenBSD's httpd access.log:

172.22.55.1:44710 -> 172.22.55.10, /favicon.ico (404 Not Found), [/] 
[/favicon.ico]

 ??

 Thanks.
-- 
Greetings,
C. L. Martinez