diff --git a/src/sessions/transcript-events.test.ts b/src/sessions/transcript-events.test.ts
index bb7a366f80e..3256793d677 100644
--- a/src/sessions/transcript-events.test.ts
+++ b/src/sessions/transcript-events.test.ts
@@ -45,7 +45,7 @@ describe("transcript events", () => {
     cleanup.push(onSessionTranscriptUpdate(first));
     cleanup.push(onSessionTranscriptUpdate(second));
 
-    expect(() => emitSessionTranscriptUpdate("/tmp/session.jsonl")).not.toThrow();
+    expect(emitSessionTranscriptUpdate("/tmp/session.jsonl")).toBeUndefined();
     expect(first).toHaveBeenCalledTimes(1);
     expect(second).toHaveBeenCalledTimes(1);
   });