diff --git a/src/lib/whoop/__tests__/sync-sleep-sweep.test.ts b/src/lib/whoop/__tests__/sync-sleep-sweep.test.ts
index 8e7cf6dab..47be030e8 100644
--- a/src/lib/whoop/__tests__/sync-sleep-sweep.test.ts
+++ b/src/lib/whoop/__tests__/sync-sleep-sweep.test.ts
@@ -28,7 +28,9 @@ const { updateManyMock, upsertMeasurementsMock, morningRefreshMock } =
         return 1;
       },
     ),
-    morningRefreshMock: vi.fn(async () => {}),
+    morningRefreshMock: vi.fn<(...args: unknown[]) => Promise<void>>(
+      async () => {},
+    ),
   }));
 
 vi.mock("@/lib/daily/morning-refresh-trigger", () => ({