This paper presents a single case study of a patient with compulsive hairpulling (trichotillomania) of 16 years' duration, who was successfully treated using electric aversion therapy. All previous attempts at treatment and self-help had been unsuccessful. A behavioural self-control programme was tried initially with some success, but the progress was not maintained following an unplanned break in treatment and this treatment was ineffective when reinstated. Electric aversion therapy eliminated hair pulling almost immediately and the results were maintained on follow-up, with the exception of a minor relapse at a time of stress.