diff --git a/packages/backend/convex/signals.ts b/packages/backend/convex/signals.ts
index 05025ec..b5b8d7d 100644
--- a/packages/backend/convex/signals.ts
+++ b/packages/backend/convex/signals.ts
@@ -498,7 +498,7 @@ export const listLinkedSignalsForProject = query({
       result[String(issue._id)] = signals
         .filter((entry): entry is LinkedSignalView => entry !== null)
         // Deterministic order: newest linked Signal first.
-        .toSorted((a, b) => b.createdAt - a.createdAt);
+        .sort((a: LinkedSignalView, b: LinkedSignalView) => b.createdAt - a.createdAt);
     }
     return result;
   },