diff --git a/static/js/dicomViewer.js b/static/js/dicomViewer.js
index 537980cc..c24c6c26 100644
--- a/static/js/dicomViewer.js
+++ b/static/js/dicomViewer.js
@@ -599,6 +599,7 @@ function selectThumbClick(evt) {
 
 export function registerPrimaryDicomInterface() {
     // Set mousetools based upon the selected options
+    let element = document.getElementsByClassName("single-dicom-viewer")[0];
     let selections = $("#primary-mouse-binding select");
     selections.each((i, option) => {
         cornerstoneTools.setToolActiveForElement(element, option.value, {
@@ -611,6 +612,7 @@ export function registerAltDicomInterface(e) {
     // Called when control is pressed
 
     // Set mousetools based upon the selected options
+    let element = document.getElementsByClassName("single-dicom-viewer")[0];
     let selections = $("#secondary-mouse-binding select");
     selections.each((i, option) => {
         cornerstoneTools.setToolActiveForElement(element, option.value, {
@@ -628,6 +630,7 @@ function changeMouseBinding(e, db) {
     // Directly activate primary tools (secondary will be activated when modifier
     // key is pressed
     if (mode == "0") {
+        let element = document.getElementsByClassName("single-dicom-viewer")[0];
         cornerstoneTools.setToolActiveForElement(element, tool, { mouseButtonMask: parseInt(button) });
     }