Amsterdam and Rotterdam both have become majority-minority cities. Cities where all ethnic population groups, including that of Dutch descent, now form a minority. Most migration research focusses on the integration of a variety of migrant groups in the city. This article addresses the group forgotten in migration research: the people of Dutch descent. What does it mean for people of Dutch descent to be part of an ethnic group that is becoming increasingly smaller in the super-diverse neighborhoods of the city? Amsterdam is often regarded as the example of a ‘happy’ super-diverse city, while Rotterdam considered to be an ‘unhappy’ super-diverse city. Our research confirms that in Rotterdam people of Dutch descent draw brighter boundaries between themselves and people of other ethnic backgrounds than their peers in Amsterdam do. It is remarkable that the difference between Rotterdam and Amsterdam is especially evident among people in the middle and higher echelons of the labour market, and less so among the working class. What causes this difference? In both cities, we see that people from the creative sector and people working in law enforcing occupations like police, army and security are characterized by a stabile attitude towards ethnic diversity. The cities’ general climate seems to influence – both positively and negatively – mainly those in administrative, technical, financial and social professions, where we find less stable attitudes towards diversity.