In this article, I show how Bruschi’s Le matérialisme politique de Louis Althusser offers, against all attempts conjure up a self-generating general theory of history, a reconstruction of Althusser’s work that shows how its systematicity relies upon the unfinished, incomplete and provisional character of scientific research, always subject to constant rectification. I then claim that, from the conceptualisa-tion of the reproduction of the mode of production as dependent upon the singularity of the con-juncture, to the theorisation of the encounter as the source of historical necessity, this constant re-working is crucial to Althusser’s ability to grasp the reality of class struggle.