Ayn Rand’s Objectivism holds a foundationalist view of knowledge—that knowledge is hierarchical, with the less basic supported by inference from the more basic, which is known directly. But two very different forms of foundationalism (deductive and presuppositional) are observable in Objectivism, and vestiges of deductivism, which Rand explicitly rejected, can be found in attempts to systematize her philosophy. This article attempts to resolve conflicts between the two approaches. It endorses presuppositional foundationalism and suggests that Rand’s view be modified accordingly.