  The LHCb collaboration has recently reported on some anomalies in $b\to s$
transitions. In addition to discrepancies with the Standard Model (SM)
predictions in some angular observables and branching ratios, an intriguing
hint for lepton universality violation was found. Here we propose a simple
model that extends the SM with a dark sector charged under an additional $U(1)$
gauge symmetry. The spontaneous breaking of this symmetry gives rise to a
massive $Z^\prime$ boson, which communicates the SM particles with a valid dark
matter candidate, while solving the $b\to s$ anomalies with contributions to
the relevant observables.
