Burundi applies the dualist system when it comes to International treaties. International treaties are only valid once they have been ratified through a rule of domestic law authorizing the application of the treaty.

This is in accordance with article 277 of the Constitution which provides that Peace treaties and commerce treaties, treaties relative to international organization, treaties which engage State finances, and those that modify legislative provisions as well as those which relate to the status of persons may only be ratified through a law. In addition, article 279 of the constitution of the Republic of Burundi which provides that treaties shall not take effect until they have been duly ratified and are subject to their application by the other party in the case of bilateral treaties and to the performance of the conditions required for their entry into force in the case of multilateral treaties. 

Also, article 19 of the Constitution provides that the rights and duties proclaimed and guaranteed by the international texts concerning human rights regularly ratified constitute an integral part of the Constitution.