H2OAir compiler warning

/home/timok/dumux-root/dumux/dumux/material/fluidsystems/h2oair.hh: In static member function 'static Scalar Dumux::FluidSystems::H2OAir<Scalar, H2Otype, Policy, useKelvinVaporPressure>::binaryDiffusionCoefficient(const FluidState&, int, int, int) [with FluidState = Dumux::ImmiscibleFluidState<double, Dumux::FluidSystems::H2OAir<double, Dumux::Components::SimpleH2O<double>, Dumux::FluidSystems::H2OAirDefaultPolicy<true>, false> >; Scalar = double; H2Otype = Dumux::Components::SimpleH2O<double>; Policy = Dumux::FluidSystems::H2OAirDefaultPolicy<true>; bool useKelvinVaporPressure = false]':
/home/timok/dumux-root/dumux/dumux/material/fluidsystems/h2oair.hh:618:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 switch (compJIdx) {
                 ^~~~~~
/home/timok/dumux-root/dumux/dumux/material/fluidsystems/h2oair.hh:623:13: note: here
             default:
             ^~~~~~~

there is a break missing after the nested switch AFAIK...