diff --git a/extensions/voice-call/index.test.ts b/extensions/voice-call/index.test.ts
index 5057dc1124d..0434d5f253a 100644
--- a/extensions/voice-call/index.test.ts
+++ b/extensions/voice-call/index.test.ts
@@ -807,7 +807,9 @@ describe("voice-call plugin", () => {
       | undefined;
     expect(startPayload).toEqual(
       expect.objectContaining({
-        operationId: expect.any(String),
+        operationId: expect.stringMatching(
+          /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/iu,
+        ),
         status: "pending",
         pollTimeoutMs: 180000,
       }),