Private damage claims against cartels may have negative effects on leniency: whereas whistleblowers obtain full immunity regarding the public cartel fines, they have no or only restricted protection against private third-party damage claims. This may stabilize cartels. We run an experiment to study this issue. Firms choose whether to join a cartel, may apply for leniency afterwards, and then potentially face private damages. We find that the implementation of private damage claims decreases cartel formation but makes cartels indeed more stable. The overall impact of private damage claims is positive: cartel prevalence declines.