The scattering of electrons by the thermal motion of the excess electronic potential of impurity ions is discussed. The excess potential is assumed as a screened Coulomb interaction of electrons with excess charge of impurity ions. The change in the electrical resistance of non-magnetic and substitutional dilute alloys due to this type of scattering is calculated at high temperature. It is assumed that the thermal motion of solute ions is quite similar to that of the perfect lattice. Calculated results are compared with the experimental deviations of the electrical resistance from Matthiessen's rule in cases of Cu-, Ag- and Au-based alloys. It is shown that the agreement between them is fairly good in most cases.