Security guards at the Palace of Westminster have called off a 24-hour strike on Wednesday after successful talks with the House of Commons Commission.
The members of the Public and Commercial Services union (PCS) were expected to walk out from 6am.
PCS general secretary Mark Serwotka said: “This is a significant victory for our security guards. It proves that strong trade union organisation and negotiation brings results.”
A number of events had been cancelled in preparation for the industrial action.
The dispute were centred around rest breaks, settlements for longstanding personal cases and the reinstatement of a sacked union member.
The union had originally said almost 250 of its members were involved in the dispute.