I put forward a version of the Cartesian Argument from Doubt for mind–body dualism. My version utilizes de re statements, which means that it is not vulnerable to the usual charge of intensional fallacy. The key de re statement is, ‘Body is such that its existence is entailed by Mind’s believing that Body does not exist’, which is false, whereas the respective ‘Mind is such that its existence is entailed by Mind’s believing that Body does not exist’ is true.