  Primordial nucleosynthesis calculations are shown to be able to provide
constraints on electroweak baryogenesis which produce a highly inhomogeneous
distribution of the baryon-to-photon ratio. Such baryogenesis scenarios
overproduce 4He and/or 7Li and can be ruled out whenever a fraction
f<3*10e-6(100 GeV/T)^3 of nucleated bubbles of broken-symmetry phase
contributes > 10% of the baryon number within the horizon volume.
