diff --git a/src/api/client.test.ts b/src/api/client.test.ts
index 962a388..f35b812 100644
--- a/src/api/client.test.ts
+++ b/src/api/client.test.ts
@@ -27,7 +27,7 @@ describe("unused SPA API client", () => {
       "/api/health",
       expect.objectContaining({ credentials: "include" }),
     );
-    const init = fetchMock.mock.calls[0]?.[1] as unknown as RequestInit;
+    const init = (fetchMock.mock.calls[0] as unknown as [string, RequestInit])[1];
     expect(init.credentials).toBe("include");
     const headers = new Headers(init.headers);
     expect(headers.get("Authorization")).toBeNull();