Abstract This paper deals with the issue of non-regression clauses, which, despite a twenty-year history, has been addressed by domestic and European case law only recently, and only with regard to the field of flexible employment. This essay argues that the Court of Justice case law on non-regression clauses (the Mangold and Angelidaki rulings) leads to a weakening of these instruments, rendering them ineffective. This ineffectiveness is due to the controversial idea of Fixed-Term Work in the era of flexicurity, and to the difficult justiciability of the particular clause in itself, as demonstrated by the most recent Court of Justice's ruling, Sorge. In addition, this essay provides an explanation of the difficult enforcement of non-regression clauses, in light of the new course of European employment policies.