G. A. Cohen casts doubt on the extent to which Marxism can contribute to a theory of equality. This essay affirms Cohen's critique. The historical materialist approach to social change, the privileged role ascribed to the proletariat, and Marx's assumption that scarcity can be abolished: these three themes account for the impatience of classical Marxists with moral commitments and normative argument, an impatience which now seems utopian. Marx was wrong about how social change comes about, and that error made it very difficult for the goal of equality to be formulated, let alone realised. ‘The egalitarian turn’ in liberalism suggests that it is liberal political theory, not Marxism, which can inform debates about equality. The insistence on neutrality about the good in much left-liberal argument, however, has forestalled consideration of the kinds of lives to which human beings should aspire, something that must be considered if we are enable individuals to live well, as Marx understood with his critique of alienation. This paper argues that questions of human flourishing are essential to questions of equality, and that Marx's perfectionist vision of the equal society ought to be retrieved.