  We consider an extension of the Standard Model with an extra gauged $U(1)'$
symmetry in presence of a 2-Higgs Doublet Model structure of the scalar sector.
We show that this scenario is able to explain the anomaly observed by the
Atomki collaboration in the decay of an excited state of Beryllium via a light
spin-1 $Z'$ with a mass of 17 MeV.
