There is little agreement among moral and political philosophers when it comes to determining what it is that makes adaptive preferences problematic. The large number of competing explanations offered by philosophers illustrates the absence of any consensus. The most prominent versions of these explanations have recently come under attack by Dale Dorsey, who argues that adaptive preferences are a red herring: the problematic nature of adaptive preferences is not explained by the fact of adaptation but by an appeal to some other normative consideration. In this article I offer an account of adaptive preferences that both accommodates the thought that only some of our adaptive preferences are problematic and responds to the skeptical challenge pressed by Dorsey. I argue that some adaptive preferences are prima facie irrational as they exhibit a peculiar error in reasoning where individuals change the semantic content of the reasons underpinning the new preference.