The status of the indispensability argument within the modal-structural interpretation is quite unique. On the one hand, the conclusion of the argument is undermined (if the proposed translation scheme goes through), since commitment to the existence of mathematical objects can be avoided. On the other hand, a revised version of the indispensability argument can be used to motivate the translation into the modal language, thus emphasizing the indispensable role played by the primitive modal notions introduced by the modal structuralist. The idea is to change the argument's second premise, insisting that modal-structural translations of mathematical theories are indispensable to our best theories of the world, and concluding that we ought to be ontologically committed to the possibility of the corresponding structures. In this sense, modal structuralists can invoke the indispensability argument in support of the translation scheme they favor and, hence, the possibility of the relevant structures, which are referred to in the conclusion of the revised argument. But rather than supporting the existence of mathematical objects, the argument would only support commitment to modal-structural translations of mathematical theories and the possibility of mathematical structures.