Refrigeration compressor provided with a pan (18) for the evaporation of defrost water, attached to the shell (13) of the compressor by means of a profile section (19) that is applied so as to engage a through-aperture (22) provided in the body of the pan. The profile section (19) is adapted to get hooked on, with its V-shaped lower end portion, to one of the pipes (30) that shoot out of the compressor. The solution is simple and rational, enabling a single type of pan to be used for differently rated and, therefore, differently sized compressors.