The ac conductivity of polycrystalline LiKSO4 doped with different concentrations of CaF2 was measured at different frequencies and temperatures. The analysis of the obtained results shows that the correlated barrier hopping is the conduction mechanism. The distribution parameter calculated from the Cole-Cole diagram indicates that the dielectric dispersion is of poly-type. Moreover its value decreases with increasing CaF2 percentage leading to the conclusion that the barrier height for some relaxation mechanisms is increased.