The article deals with Kant's theory of the self in Patricia Kitcher's Kant's Thinker in three respects: (1) I argue that it is doubtful whether accompanying representations with the ‘I think’ as such yields a principle for the categories since it does not require any strong kind of connection between them. (2) I discuss textual evidence for and against Kitcher's attempt to make sense of Kant's claim that the ‘I think’ requires the continued existence of cognizers per se. (3) I ask whether Kitcher's understanding of Kant's positive theory of the self leans towards minimal substantialism or towards functionalism.