In June 2022, the International Labour Organization (ILO) decided to amend the 1998 Declaration on Fundamental Principles and Rights at Work in order to include the right to a safe and healthy working environment among the core labour rights to which member States are committed by virtue of their membership. The amendment marks the successful completion of three years of negotiations initiated in response to the 2019 Centenary Declaration by which the ILO's tripartite constituency recognized that safe and healthy working conditions were fundamental to decent work. Adding occupational safety and health as a fifth pillar to the 1998 Declaration was generally welcomed as a commendable development although critics may still assert that as a soft law instrument the amended Declaration may not have decisive impact on workplace safety and health globally. Despite broad agreement about the timeliness and importance of recognizing occupational safety and health as a fundamental workers’ right—especially in light of the pandemic experience—concerns were raised about the possible implications of the amended Declaration on existing trade agreements, and in particular whether it would create, directly or indirectly, new obligations for member States. This article looks into the origins and negotiating history of the amendment to the 1998 Declaration and addresses the scope and legal effect of a saving clause by which the Conference sought to ensure that the amended Declaration would not impact obligations and commitments of States set out in labour provisions of free trade agreements currently in force and would not be subject to dynamic interpretation in the context of a trade dispute.