  The CHIME/FRB collaboration recently reported the detection of a 16 day
periodicity in the arrival times of radio bursts from FRB 180916.J0158+65. We
study the possibility that the observed periodicity arises from free precession
of a magnetized neutron star, and put constraints on different components of
the star's magnetic fields. Using a simple geometric model, where radio bursts
are emitted from a rotating neutron star magnetosphere, we show that the
emission pattern as a function of time can match that observed from FRB
180916.J0158+65.
