  The purpose of this work is to stress on a mathematical requirement of the
Stokes' theorem that, naturally, yields a reassessment of the electric charge
quantization condition, which is, here, explicitly carried out in the context
of the Aharonov-Bohm set-up. We argue that, by virtue of an ambiguity in the
definition of the circulation of the vector potential, a modified quantization
condition comes out for the electric charge that opens the way for
understanding fundamental fractional charges. One does not, any longer, need to
rely on the existence of a magnetic monopole to justify electric charge
quantization.
