The invention relates to a process for dedusting a pulverulent building material composition, preferably a factory dry mortar and in particular tile adhesive, joint filler, filling compound, sealing slurry, repair mortar, levelling mortar, reinforcing adhesive, adhesive for composite thermal insulation systems (CTIS), mineral render, fine filler and screed systems, at least one dedusting agent which is liquid at 20° C. being brought into contact with the pulverulent building material composition at a temperature of >40° C. Preferably this occurs by spraying.