  We study the influence of Gribov copies in the Coulomb gauge on the smeared
hadronic correlation functions that are involved in the determination of the B
meson decay constant. We find that the residual gauge freedom associated to
Gribov copies induces observable noise effects, though at the level of
numerical accuracy of our simulation these effects are not relevant to the
final determination of f_B. Our results indicate that such effects may become
important on bigger lattices.
