In this paper, I discuss the ambiguity problem which concerns the heterodox view on the qualitative identity/difference of similar fermions. According to the heterodox view, similar fermions are (almost always) qualitatively distinct, so that Leibniz’s Principle of the Identity of Indiscernibles is valid (this view contrasts with the orthodox view, according to which the opposite is the case). However, several authors have pointed out that there is an ambiguity problem for the qualitative individuation of similar fermions, i.e., individuation via properties is not unique. More specifically, there is a type of ambiguity according to which fermions sometimes possess definite spin properties in more than one direction (at the same time), which straightforwardly contradicts quantum-mechanical principles. I discuss this alleged spin-ambiguity, and conclude that (luckily) it does not survive closer scrutiny.