On June 26, 2018, the Court of Justice of the European Union ruled in MB v. Secretary of State for Work and Pensions that a member state may not require an individual who has changed gender to annul his or her marriage, which was entered into before changing genders, in order to receive a retirement pension at the age necessary for the gender he or she has acquired. The case concerns MB, who was born male, married a woman, and later underwent sex reassignment surgery, but did not obtain a certificate of recognition of her change of gender, since that would have required her to annul her marriage under U.K. law. Upon reaching the age of sixty, the age of retirement for women, MB’s application for retirement pension was denied because she could not be classified as a woman without a gender classification certificate and the age of retirement for a man would have been sixty-five. MB argued that this amounted to discrimination, and the Court concluded that the “legislation treats less favourably a person who has changed gender after marrying than it treats a person who has retained his or her birth gender and is married.” The Court found that “the UK legislation constitutes direct discrimination based on sex and is, for that reason, prohibited by the Directive.”