  If the solution to the solar neutrino puzzle falls in the LMA region, KamLAND
should be able to measure with good precision the corresponding oscillation
parameters after a few years of data taking. Assuming a positive signal, we
study their expected sensitivity to the solar parameters (theta_{12},Delta
m^2_{21}) when considered in the framework of three-neutrino mixing after
taking into account our ignorance on the mixing angle theta_{13}. We find a
simple ``scaling'' dependence of the reconstructed theta_{12} range with the
value of theta_{13} while the Delta m^2_{12} range is practically unaffected.
Our results show that the net effect is approximately equivalent to an
uncertainty on the overall neutrino flux normalization of up to sim 10 %.
