This article appraises the impact of the Advisory Opinion of 7 July 2004 on the development of self-determination as a legal principle. The plight of the Palestinians being widely understood as a textbook self-determination struggle, the Court had to address the issue in its examination of the case at hand. Self-determination left an indelible mark upon the Opinion, from the decision to allow Palestine to participate, through the use of the principle as applicable law, to the elucidation of the violations and the erga omnes character of the obligations breached. The article examines the Court's positions, which, however sparsely elaborated, may have serious repercussions on the understanding of the principle and on its handling in future judicial proceedings.