A united-atom molecular simulation force field for liquid dimethyl sulfoxide has been found to produce unacceptably inaccurate densities when used with a reaction-field or Ewald treatment of the electrostatic interactions. The force field is mildly reparameterized leading to a smaller dipole moment and slightly larger methyl groups. In addition to being compatible with the more sophisticated treatment of Coulombic interactions, the new force field also results in a significantly better description of the diffusion coefficient, the shear viscosity and the dielectric constant. Other liquid properties remain at the satisfactory quality of the Liu et al. model. (C) 2003 Elsevier Science B.V. All rights reserved.