  We discuss the Aharonov-Bohm effect in the presence of hidden photons
kinetically mixed with the ordinary electromagnetic photons. The hidden photon
field causes a slight phase shift in the observable interference pattern. It is
then shown how the limited sensitivity of this experiment can be largely
improved. The key observation is that the hidden photon field causes a leakage
of the ordinary magnetic field into the supposedly field-free region. The
direct measurement of this magnetic field can provide a sensitive experiment
with a good discovery potential, particularly below the $\sim$ meV mass range
for hidden photons.
