In the debate on how to strengthen the European Union’s (EU) capacity to act, calls for an extension of qualified majority voting (QMV) are growing louder. The Council of the EU is currently discussing using the so-called passerelle clauses in the Treaty on European Union (TEU). With these clauses, more decisions by QMV could be intro-duced without a major treaty change or a convention. However, abolishing national vetoes in this way would first require unanimity as well as, in some cases, additional national approval procedures. Such unanimity is currently not in sight, as resistance is prevailing in smaller and medium-sized member states, which fear that they could be regularly outvoted. What is needed, therefore, is an institutional reform package in which decisions by QMV are extended with the aim of facilitating further enlarge-ment of the EU and are accompanied by emergency clauses to protect core national interests.