  Formal field theory requires, even in the presence of a Brout-Englert-Higgs
effect, to maintain manifest non-perturbative gauge invariance. The
Fr\"ohlich-Morchio-Strocchi mechanism allows nonetheless an augmented
perturbative treatment. We perform such an augmented tree-level analysis for
the minimal supersymmetric standard model. We find that, as for the standard
model, corrections to standard perturbation theory are only sub-leading.
