diff --git a/extensions/inworld/tts.test.ts b/extensions/inworld/tts.test.ts
index 33f57b6ac99..71e922bd4aa 100644
--- a/extensions/inworld/tts.test.ts
+++ b/extensions/inworld/tts.test.ts
@@ -335,7 +335,9 @@ describe("inworldTTS", () => {
   it("releases the guarded dispatcher after failure", async () => {
     const { release } = queueGuardedResponse(new Response("fail", { status: 500 }));
 
-    await expect(inworldTTS({ text: "test", apiKey: "test-key" })).rejects.toThrow();
+    await expect(inworldTTS({ text: "test", apiKey: "test-key" })).rejects.toThrow(
+      "Inworld TTS API error (500): fail",
+    );
     expect(release).toHaveBeenCalledTimes(1);
   });
 });