Is my cassette Knackered ?

Just took of my back wheel and i can actually wiggle the cassette slightly. Is this a sign of wear or could the freehub body be worn? i'm sure that i not meant to be able to wiggle the cassette like that, its not really really loose and the lock ring seems fine but i can wiggle it about abit though.
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Parktools :?:SheldonBrown
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