This paper assesses the most well thought out contemporary conception of republican liberty put forward by Philip Pettit and Quentin Skinner. I demonstrate that it is incoherent: at least insofar as it seeks to pick out a form of unfreedom not captured by the negative conception of liberty. This incoherence arises because Pettit and Skinner cannot both hold that republican unfreedom is defined by one agent’s mere capacity to interfere arbitrarily with another agent and, at the same time, claim that republican freedom can be promoted by deterrence mechanisms. My contribution to contemporary republican theory is to suggest that a coherent republican conception can be achieved, however, through an important revision. This is to replace Pettit ...