£50 for Aberystwyth University staff who did not strike
University bosses in Ceredigion gave a £50 bonus to staff who worked while their colleagues took strike action in a dispute over pensions.
Aberystwyth University made the payment following the industrial action during freshers' weekend in September 2014.
Roger Bevan from the union Unison said members were "incensed" by the move.
The university said the bonus thanked staff who worked to organise freshers' activities on a "crucial weekend".
Trade unions organised the strike as a protest against plans to close a pension scheme for lower-paid workers.
Unison said members were appalled workers had been "rewarded" for not taking part.
Wales organiser Mr Bevan said: "It has been used to induce members not to participate in their union's activities."
The union has written to the university asking for the payment to be withdrawn.
A university spokesman said the bonus was in recognition of staff who worked on a vital weekend.
"We wish to thank staff who contributed to our freshers' weekend activities and often acknowledge team contributions like this via a range of recognition processes," the spokesman added.