Autonomy, traditionally conceived, is the capacity to direct one’s actions in light of self-given principles or values. Character, traditionally conceived, is the set of unchosen, relatively rigid traits and proclivities that influence, constrain, or determine one’s actions. It’s natural to think that autonomy and character will be in tension with one another. In this paper, I argue that this is a mistake: while character influences and constrains choice, this poses no problem for autonomy. However, in particular cases character can affect autonomy by generating a particular kind of influence upon choice. As a first approximation, character limits autonomy when it influences the agent’s choice in a way that were she aware of it, (1) she would disavow the influence, and (2) the influence could no longer operate in the same way. Put a bit differently, I argue that character undermines autonomy when it generates reflectively unstable perceptions of warrant.