One is practically irrational when one holds beliefs and intentions standing in incoherent relations. However, to be truly practically irrational, does one also need to believe that one’s incoherent intentions can make a difference in one’s future actions? In other words, does practical irrationality constitutively implicate a belief in the self-efficacy of one’s incoherent intentions? Intriguingly, an overwhelming majority of contemporary philosophers have given an affirmative answer to this question when it comes to instrumental irrationality. However, I argue that the seemingly innocuous incorporation of self-efficacy belief within our analysis of practical irrationality has dangerous results. And I motivate an alternative view on the relation between practical irrationality and self-efficacy belief.