  We study one-loop quantum corrections to gauge couplings in heterotic vacua
with spontaneous supersymmetry breaking. Although in non-supersymmetric
constructions these corrections are not protected and are typically model
dependent, we show how a universal behaviour of threshold differences, typical
of supersymmetric vacua, may still persist. We formulate specific conditions on
the way supersymmetry should be broken for this to occur. Our analysis implies
a generalised notion of threshold universality even in the case of unbroken
supersymmetry, whenever extra charged massless states appear at enhancement
points in the bulk of moduli space. Several examples with universality,
including non-supersymmetric chiral models in four dimensions, are presented.
