diff --git a/extensions/codex/src/app-server/run-attempt.test.ts b/extensions/codex/src/app-server/run-attempt.test.ts
index cca5ce05f35..28ef39e93ff 100644
--- a/extensions/codex/src/app-server/run-attempt.test.ts
+++ b/extensions/codex/src/app-server/run-attempt.test.ts
@@ -938,6 +938,7 @@ describe("runCodexAppServerAttempt", () => {
     const run = runCodexAppServerAttempt(params);
     await harness.waitForMethod("turn/start");
     expect(llmInput).toHaveBeenCalled();
+    await new Promise<void>((resolve) => setImmediate(resolve));
 
     expect(llmInput.mock.calls).toEqual(
       expect.arrayContaining([