The study focuses on the relationship between prosocial behavior and the expectation of prosocial behavior from others. According to the social exchange theory and the norm of reciprocity, correlation can be expected. The sample consisted of 80 high school students. The prosocial behavior and the expectation of prosocial behavior were measured by means of an inventory. Prosocial behavior was also measured by observation (respondents had three opportunities to behave prosocially in standardized situations). The relationship between prosocial behavior and its expectation was significantly manifested by the expectation of prosocial behavior toward others in a real situation. People, who behave more prosocially, express more clearly to other people that they should help others.