diff --git a/backend/src/api/controllers/result.ts b/backend/src/api/controllers/result.ts
index 6396836cf..46b04af16 100644
--- a/backend/src/api/controllers/result.ts
+++ b/backend/src/api/controllers/result.ts
@@ -275,7 +275,7 @@ export async function addResult(
       throw new MonkeyError(status.code, "Missing key data");
     }
     if (result.keyOverlap === undefined) {
-      throw new MonkeyError(400, "Duration is using old calculation");
+      throw new MonkeyError(400, "Old key data format");
     }
     if (anticheatImplemented()) {
       if (!validateKeys(result, uid)) {
diff --git a/frontend/src/ts/test/test-logic.ts b/frontend/src/ts/test/test-logic.ts
index e3cc0fae8..5f3d97286 100644
--- a/frontend/src/ts/test/test-logic.ts
+++ b/frontend/src/ts/test/test-logic.ts
@@ -1823,9 +1823,9 @@ async function saveResult(
       }
     }
     console.log("Error saving result", completedEvent);
-    if (response.message === "Duration is using old calculation") {
+    if (response.message === "Old key data format") {
       response.message =
-        "Duration is using old calculation. Please refresh the page to download the new update. If the problem persists, please contact support.";
+        "Old key data format. Please refresh the page to download the new update. If the problem persists, please contact support.";
     }
     return Notifications.add("Failed to save result: " + response.message, -1);
   }