I argue, contra Sabina Lovibond, that one cannot defend a viable form of moral realism from the perspective of linguistic conventionalism. Appealing to the later Wittgenstein, I argue that Wittgenstein's alleged linguistic conventionalism rests on the objective ground of the notion of a rule. While Wittgenstein acknowledges that the subjective and social context out of which we operate precludes getting at reality independent of a perspective, neither is he an anti-realist nor does he replace truth conditions with assertibility conditions. If (...) conventions are grounded in the notion of a rule, we can then use this conclusion to defend a form or moral realism. (shrink)