Slow-switching objections are common complaints against content-externalism, the view that the content of one’s mental states is at least partly individuated by the relations which one bears to one’s environment. Typically, these objections purport to show that if content-externalism is true, then switching a subject between two relevantly dissimilar environments (in such a way that the subject does not know that she is being switched) can undermine knowledgeability of her mental states. In this paper, I develop a different kind of slow-switching objection to the views of one particularly prominent externalist, Tyler Burge. I argue that given Burge’s views about the way in which mental content is individuated, slow-switching can undermine knowledgeability of one’s reasons. I argue that this is a prima facie troubling result, given Burge’s views about the sorts of things that reasons are.