  We consider the potential of a generic neutrino factory (NUFACT) in probing
non-standard neutrino-matter interactions (NSI). We find that the sensitivity
to flavour-changing (FC) NSI can be substantially improved with respect to
present atmospheric neutrino data, especially at energies higher than
approximately 50 GeV, where the effect of the tau mass is small. For example, a
100 GeV NUFACT can probe FC neutrino interactions at the level of few
$|\epsilon| < {few} \times 10^{-4}$ at 99 % C.L.
