diff --git a/src/app/utils/haptics.test.ts b/src/app/utils/haptics.test.ts
index 01256bfee..93ffa77ee 100644
--- a/src/app/utils/haptics.test.ts
+++ b/src/app/utils/haptics.test.ts
@@ -2,32 +2,40 @@ import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { hapticsSupported, tick } from './haptics';
 
-const g = globalThis as { navigator?: unknown; window?: unknown };
+// Node 22 exposes a read-only `globalThis.navigator`; swap it via defineProperty.
+const original = Object.getOwnPropertyDescriptor(globalThis, 'navigator');
+const setGlobal = (name: 'navigator' | 'window', value: unknown) =>
+  Object.defineProperty(globalThis, name, { value, configurable: true, writable: true });
+const restore = () => {
+  if (original) Object.defineProperty(globalThis, 'navigator', original);
+  else delete (globalThis as { navigator?: unknown }).navigator;
+  delete (globalThis as { window?: unknown }).window;
+};
 
 test('tick is a no-op without the API, with the setting off, or under reduced motion', () => {
-  g.navigator = {};
+  setGlobal('navigator', {});
   assert.equal(hapticsSupported(), false);
   assert.equal(tick('ptt-on'), false);
 
   const calls: number[] = [];
-  g.navigator = { vibrate: (ms: number) => calls.push(ms) === 1 };
-  g.window = { matchMedia: () => ({ matches: true }) };
+  setGlobal('navigator', { vibrate: (ms: number) => calls.push(ms) === 1 });
+  setGlobal('window', { matchMedia: () => ({ matches: true }) });
   assert.equal(tick('ptt-on'), false);
   assert.deepEqual(calls, []);
 
-  g.window = { matchMedia: () => ({ matches: false }) };
+  setGlobal('window', { matchMedia: () => ({ matches: false }) });
   assert.equal(tick('ptt-on', false), false);
   assert.deepEqual(calls, []);
+  restore();
 });
 
 test('tick vibrates per kind when allowed', () => {
   const calls: number[] = [];
-  g.navigator = { vibrate: (ms: number) => calls.push(ms) > 0 };
-  g.window = { matchMedia: () => ({ matches: false }) };
+  setGlobal('navigator', { vibrate: (ms: number) => calls.push(ms) > 0 });
+  setGlobal('window', { matchMedia: () => ({ matches: false }) });
   assert.equal(tick('ptt-on'), true);
   assert.equal(tick('ptt-off'), true);
   assert.equal(tick('reaction'), true);
   assert.deepEqual(calls, [10, 10, 8]);
-  delete g.navigator;
-  delete g.window;
+  restore();
 });