This article proposes a metaethical route from neo-Aristotelian naturalism, as developed in particular by Philippa Foot, to virtue-ethical longtermism. It argues that the metaethical assumptions of neo-Aristotelian naturalism inherently imply that a valid description of the life-form of a species must satisfy a formal requirement of internal sustainability. The elements of a valid life-form description then serve as a normative standard. Given that humans have the ability to influence the fate of future generations and know about their influence, this article (...) posits that our future as a species becomes a part of the description of the human life-form. Consequently, in our case, the sustainability requirement is extended into the future, leading to a minimal and humanist version of longtermism. As in Rosalind Hursthouse’s naturalistic virtue ethics, the focus of the proposed virtue-ethical longtermism remains on developing virtues as the only reliable way for the agent to achieve the good life. However, since what can count as virtue must be compatible with a life-form description that, taken as a whole, facilitates the long-term survival of our species, this position still implies a genuine longtermism, although it contrasts with the quantifying and maximizing logic of consequentialism. (shrink)