diff --git a/Libraries/LibWeb/WebGL/WebGL2RenderingContextBase.idl b/Libraries/LibWeb/WebGL/WebGL2RenderingContextBase.idl
index e505dc0331a..069f5ab2574 100644
--- a/Libraries/LibWeb/WebGL/WebGL2RenderingContextBase.idl
+++ b/Libraries/LibWeb/WebGL/WebGL2RenderingContextBase.idl
@@ -421,7 +421,7 @@ interface mixin WebGL2RenderingContextBase {
     [FIXME] any getIndexedParameter(GLenum target, GLuint index);
     [FIXME] sequence<GLuint>? getUniformIndices(WebGLProgram program, sequence<DOMString> uniformNames);
     [FIXME] any getActiveUniforms(WebGLProgram program, sequence<GLuint> uniformIndices, GLenum pname);
-    [FIXME] GLuint getUniformBlockIndex(WebGLProgram program, DOMString uniformBlockName);
+    GLuint getUniformBlockIndex(WebGLProgram program, DOMString uniformBlockName);
     any getActiveUniformBlockParameter(WebGLProgram program, GLuint uniformBlockIndex, GLenum pname);
     DOMString? getActiveUniformBlockName(WebGLProgram program, GLuint uniformBlockIndex);
     undefined uniformBlockBinding(WebGLProgram program, GLuint uniformBlockIndex, GLuint uniformBlockBinding);