diff --git a/js/util/boundingbox.js b/js/util/boundingbox.js
index 14062cd49..be8b1ba6c 100644
--- a/js/util/boundingbox.js
+++ b/js/util/boundingbox.js
@@ -121,7 +121,7 @@ let annotationObjects = {
         // update class of folder and track id instead of creating new folder
         folderBoundingBox3DArray[selectedObjectIndex].domElement.children[0].children[0].innerHTML = newClassLabel + ' ' + nextTrackIdNewClass;
         //                                                           ul        number      div       div[class c]    input
-        folderBoundingBox3DArray[selectedObjectIndex].domElement.children[0].children[3].children[0].children[1].children[0].value = nextTrackIdNewClass;
+        folderBoundingBox3DArray[selectedObjectIndex].domElement.children[0].children[4].children[0].children[1].children[0].value = nextTrackIdNewClass;
 
         // open current folder
         folderBoundingBox3DArray[selectedObjectIndex].open();