Michel Foucault suggested that, in order to understand his own archeology, we have to rely on Heidegger. Gilles Deleuze, in his Foucault, claims that the last Foucault really rediscovered Heidegger, that he underlined some crucial connections between the phenomenologist’s views and Wittgenstein’s position, and that his true aim was to convert phenomenology into epistemology. In her polemic essay, Élisabeth Rigal argues that such a reading of Foucault’s project is not convincing, since it implies not only a reductionist approach to phenomenology, but also a misunderstanding of Wittgenstein’s problems.