diff --git a/packages/zone/package.json b/packages/zone/package.json
index 45f7eaeb1ac6..4c123d60c794 100644
--- a/packages/zone/package.json
+++ b/packages/zone/package.json
@@ -42,6 +42,7 @@
     "@endo/promise-kit": "^1.0.4"
   },
   "devDependencies": {
+    "@agoric/internal": "^0.3.2",
     "@agoric/swingset-liveslots": "^0.10.2",
     "@endo/env-options": "^1.1.1",
     "@endo/patterns": "^1.2.0",
diff --git a/packages/zone/test/async-flow/test-async-flow.js b/packages/zone/test/async-flow/test-async-flow.js
index c5d39d175661..cb602005c258 100644
--- a/packages/zone/test/async-flow/test-async-flow.js
+++ b/packages/zone/test/async-flow/test-async-flow.js
@@ -11,6 +11,7 @@ import {
 import { Fail } from '@endo/errors';
 // import { E } from '@endo/far';
 // import E from '@agoric/vow/src/E.js';
+import { eventLoopIteration } from '@agoric/internal/src/testing-utils.js';
 import { isVow } from '@agoric/vow/src/vow-utils.js';
 import { makePromiseKit } from '@endo/promise-kit';
 import { prepareVowTools } from '@agoric/vow';
@@ -218,14 +219,14 @@ await test.serial('test durable async-flow', async t => {
   const vowTools1 = prepareWatchableVowTools(zone1);
   await testFirstPlay(t, zone1, vowTools1);
 
-  await new Promise(r => setTimeout(r));
+  await eventLoopIteration();
 
   nextLife();
   const zone2 = makeDurableZone(getBaggage(), 'durableRoot');
   const vowTools2 = prepareWatchableVowTools(zone2);
   await testBadReplay(t, zone2, vowTools2, asyncFlowVerbose());
 
-  await new Promise(r => setTimeout(r));
+  await eventLoopIteration();
 
   // nextLife();
   // const zone3 = makeDurableZone(getBaggage(), 'durableRoot');