Promoting interpersonal helping among coworkers is an important aim for any organisation that cares about employee well-being. Drawing on guilt aversion hypothesis, this research focuses on the power of social expectations in promoting prosocial behaviour among employees and investigates the role of anticipated guilt for failing to meet coworkers’ expectations. In two preregistered studies, the effect of beneficiary expectation on benefactors’ anticipated guilt and intention to help was investigated. In Study 1, Japanese participants (n = 284) recalled a situation when (...) they helped a coworker spontaneously, and evaluated perceived beneficiary expectation to receive help, as well as anticipated guilt for not helping. Beneficiary expectation positively predicted anticipated guilt, and the effect was stronger when the beneficiary was a same-status colleague, and when interpersonal helping frequency in the organisation was low. Study 2 (n = 499) employed vignettes and manipulated beneficiary expectation. A mediational model revealed that beneficiary expectation leads to more anticipated guilt for not helping, which, in turn, increases employees’ intention to help. Together, these studies show that employees are sensitive to their coworkers’ expectations, and guilt-averse; therefore, interpersonal helping among employees may be promoted by establishing legitimate expectations of prosociality in the workplace. (shrink)