The invention relates to a humanized monoclonal antibody or fragment thereof which specifically binds to human interlukin-2 (IL2), whereby said humanized monoclonal antibody neutralizes the activity of human IL2 by binding to the human IL2 prior to, during, and/or subsequent to the binding of the human IL2 to the human IL2-receptor, and wherein the light chain variable region of the humanized monoclonal antibody comprises in its second framework region the contiguous amino acid sequence KAPKA at amino acid positions 42-46.