diff --git a/frontend/src/framework/internal/components/SelectEnsemblesDialog/selectEnsemblesDialog.tsx b/frontend/src/framework/internal/components/SelectEnsemblesDialog/selectEnsemblesDialog.tsx
index 33d2f0db5..e490b6854 100644
--- a/frontend/src/framework/internal/components/SelectEnsemblesDialog/selectEnsemblesDialog.tsx
+++ b/frontend/src/framework/internal/components/SelectEnsemblesDialog/selectEnsemblesDialog.tsx
@@ -28,7 +28,7 @@ import { UserAvatar } from "./private-components/userAvatar";
 
 import { LoadingOverlay } from "../LoadingOverlay";
 
-const CASE_UUID_ENSEMBLE_NAME_SEPARATOR = "~&&~";
+const CASE_UUID_ENSEMBLE_NAME_SEPARATOR = "~@@~";
 
 // Ensemble element item for a delta ensemble
 export type DeltaEnsembleElementItem = {
diff --git a/frontend/tests/unit/DeltaEnsemble.test.ts b/frontend/tests/unit/DeltaEnsemble.test.ts
index d236651fd..f3fbb4824 100644
--- a/frontend/tests/unit/DeltaEnsemble.test.ts
+++ b/frontend/tests/unit/DeltaEnsemble.test.ts
@@ -73,7 +73,7 @@ describe("DeltaEnsemble", () => {
         // Use display name of compare and reference ensemble if no custom name is provided
         const DeltaEnsembleWithoutCustomName = new DeltaEnsemble(COMPARE_ENSEMBLE, REFERENCE_ENSEMBLE, "red");
         expect(DeltaEnsembleWithoutCustomName.getDisplayName()).toBe(
-            "Custom Name First Ensemble - Custom Name Second Ensemble"
+            "(Custom Name First Ensemble) - (Custom Name Second Ensemble)"
         );
     });