diff --git a/frontend/tests/rectification-grounding-read-case-20260927.test.ts b/frontend/tests/rectification-grounding-read-case-20260927.test.ts
index 0eee733d..0748e6f7 100644
--- a/frontend/tests/rectification-grounding-read-case-20260927.test.ts
+++ b/frontend/tests/rectification-grounding-read-case-20260927.test.ts
@@ -71,7 +71,7 @@ async function readCaseFor(turns: unknown[]) {
       turnId: TURN_ID,
       userMessage: "2014 年结婚",
       accounting: accounting.client as never,
-    }) as Record<string, { execute(input: unknown): Promise<Record<string, unknown>> }>;
+    }) as unknown as Record<string, { execute(input: unknown): Promise<Record<string, unknown>> }>;
     const readCase = await tools["rectification-read-case"].execute({ caseId: CASE_ID });
     return { readCase, candidateCount: latest.candidates.length };
   } finally {