diff --git a/extensions/cornerstone/src/hps/fourUp.ts b/extensions/cornerstone/src/hps/fourUp.ts
index d4c05cbf0..3ac22bb3e 100644
--- a/extensions/cornerstone/src/hps/fourUp.ts
+++ b/extensions/cornerstone/src/hps/fourUp.ts
@@ -75,7 +75,7 @@ export const fourUp = {
           },
           displaySets: [
             {
-              id: 'mprDactiveDisplaySetisplaySet',
+              id: 'activeDisplaySet',
               options: {
                 displayPreset: {
                   CT: 'CT-Bone',