In the article, the regulatory trajectories of variable hours contracts (VHCs, denoting on-call contracts, and zero-hours contracts) are analysed in two countries, the Netherlands and Finland. The unity or disunity in social partners’ readiness for bringing the issue of VHCs to the agenda of collective bargaining has implications for the labour market regimes. From the institutional change perspective, the shared agenda in regulating the VHCs implies conversion of the labour market regime in the Netherlands. In Finland, layering was seen in the development of labour legislation, whereas the disregard of VHCs in collective bargaining implies drift. In Finland, the ‘legislative route’ of regulating conditions of labour may strengthen, undermining the negotiatory autonomy of social partners, earlier embedded in the structure of the Nordic labour market regime.