People have the automatic tendency to mimic their interaction partners. Mimicry theories propose that such mimicking behavior is beneficial for the mimicker as mimicked persons tend to like, trust and help the mimicker more. Yet an open question remains as to whether prosocial effects translate to parties other than the mimicker. To test for the presence of such a spillover effect, we ran two field experiments (total N = 460). In all experiments, participants interacted with an experimenter. The experimenter either verbally mimicked the participants or behaved naturally. Afterwards, either the experimenter or another person asked participants to donate to a charity. Across all experiments, our results indicate that irrespective of whether a donation request is made by the mimicker or another person, mimicry increases the likelihood to donate to a charity, but not the amount that participants are willing to donate. Bayesian analyses suggest that this effect is less strongly pronounced than assumed by previous research and theories.