There is an increasing concern in the development community about the increase in the ‘feminisation of bad jobs’ of many developing countries. Indeed, recent analysis shows a growing proportion of women are in jobs with poor working conditions and low pay. But what is driving this phenomenon? This paper addresses this issue by looking at the role of social institutions, i.e. traditions, social norms and informal laws, in shaping labour market outcomes. By applying the newly established Social Institutions and Gender Index (SIGI) of the OECD on 44 developing countries, the paper finds that social institutions influence to a great extent activity patterns and job quality for women. Our results suggest that addressing discriminating social institutions is crucial for advancing gender equality.