BOULDER, Colo. (AP) -- Civil rights advocates plan to challenge Boulder's ban on camping in public places, saying it makes criminals out of the homeless.

The American Civil Liberties Union of Colorado filed a notice Monday that it will appeal the conviction of a homeless man for sleeping on public property. Mark Silverstein of the ACLU says Boulder's ordinance is unconstitutional.

Boulder spokesman Patrick von Keyserling says the city doesn't comment on pending litigation.

Homeless advocates recently protested Boulder's ordinance by sleeping in plain sight in public parks. Violators can be fined $100 or sentenced to community service.

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