 If determinism is true, and if at any given time, an unimpeded agent is completely determined to have the wants that she does have, and if those wants causally determine her actions, then, even though she does do what she wants to do, she cannot ever do otherwise. She satisfies the classical compatibilist conditions for free will. But free will requires the ability to do otherwise, and determinism is incompatible with this. Hence, the classical compatibilist account of free will is inadequate. Determinism is incompatible with free will and moral responsibility because determinism is incompatible with the ability to do otherwise.