 A way of reconciling the two sides of the debate about Newcomb’s problem acknowledges that a rational person should prepare for the problem by cultivating a disposition to one-box. Then whenever the problem arises, the disposition will prompt a prediction of one-boxing and afterwards the act of one-boxing (still freely chosen). Causal decision theory may acknowledge the value of this preparation. It may conclude that cultivating a disposition to one-box is rational although one-boxing itself is irrational. Hence, if in Newcomb’s problem an agent two-boxes, causal decision theory may concede that the agent did not rationally prepare for the problem. It nonetheless maintains that two-boxing itself is rational. Although two-boxing is not the act of a maximally rational agent, it is rational given the circumstances of Newcomb’s problem.