Today, consumers expect companies to be socially responsible. However, the literature is undecided about the effects of communicating one's corporate social responsibility activities to consumers. This raises the question of how sustainability-driven companies can best advertise their products to stimulate ethical consumption: using self-benefit frames, where the main beneficiary is the consumer, or using other-benefit frames, where the main beneficiary is a third party. Using three experiments, this study examines the effect of other-benefit (vs. self-benefit) advertising frames on consumers' impulse purchases from sustainability-driven companies. Increasing impulse purchases can help such companies to strengthen their competitive positions. Additionally, it is studied to what extent two types of justification (moral versus deservingness) explain the proposed effect of advertising frames. The results show that only other-benefit frames affect impulse buying behavior, both directly, as mediated by moral justification. This study's insights may help sustainability-driven companies to decide on their advertising strategies by providing evidence that other-benefit-framed advertisements are more effective in enhancing impulse purchases than self-benefit-framed advertisements.