Maximum mass M_max for hybrid stars containing quark matter obeying the simple bag model equation of state. We show the dependence on ﹩\left(m^{2}_{s}-4\Delta ^{2}\right)^{1/ 2}﹩. Increasing this quantity decreases B_eff at fixed ρ_c, giving rise to larger maximum masses. The maximum mass is only weakly dependent on the transition density, particularly when the perturbative correction is included.