  I consider a new semiclassical expansion for the inflaton field in the
framework of warm inflation scenario. The fluctuations of the matter field are
considered as thermally coupled with the particles of the thermal bath. This
coupling parameter depends on the temperature of the bath. The power spectrum
remains invariant under this new semiclassical expansion for the inflaton.
However, I find that the thermal component of the amplitude for the primordial
field fluctuations should be very small at the end of inflation.
