This study draws on deontic justice theory to examine an unexplored socioemotional micro-foundation of corporate social responsibility (CSR), namely anticipated guilt, in an effort to improve our understanding of employees’ moral reactions to their organization’s CSR. We empirically investigate whether environmental CSR induces anticipated guilt (i.e., concerns about future guilt for not contributing to organizational CSR) leading to organizational environmental citizenship behavior. We also consider two boundary conditions related to the social nature of anticipated guilt: line manager support for the environment and negative environmental group norms. To test our hypotheses, we analyzed data from a convenience sample of 503 managers working in Mexican organizations, using Latent Moderated Structural equation modeling. Overall, our results support the deontic argument that employees care about CSR because CSR embodies moral concerns. Specifically, our findings show that efforts to avoid a guilty conscience increase when the line manager provides increased resources and control to act for the environment, and when group members do not care for the environment, suggesting that employees feel they have to compensate for their group’s moral failure.