  We study the influence of the frictional heating on the wind line-profiles of
SMC stars. For this purpose we use our NLTE wind code to obtain consistent
occupation numbers of studied levels and our radiative transfer code to solve
the radiative transfer equation in moving media. We compare predicted wind line
profiles calculated with and without frictional heating for a low-luminosity
SMC star with a weak wind and discuss the relevance of frictional heating as a
solution of a "weak-wind problem" for this star.
