diff --git a/src/main/ts/spawn.ts b/src/main/ts/spawn.ts
index 608848f..0448894 100644
--- a/src/main/ts/spawn.ts
+++ b/src/main/ts/spawn.ts
@@ -2,7 +2,7 @@ import * as cp from 'node:child_process'
 import process from 'node:process'
 import EventEmitter from 'node:events'
 import { Readable, Writable, Stream, Transform } from 'node:stream'
-import { assign, noop, randomId, g } from './util.js'
+import { assign, noop, randomId, g, immediate } from './util.js'
 
 export * from './util.js'
 
@@ -102,7 +102,7 @@ export const defaults: TSpawnCtxNormalized = {
   get stdout(){ return new VoidStream() },
   get stderr(){ return new VoidStream() },
   stdio:      ['pipe', 'pipe', 'pipe'],
-  run:        g.setImmediate,
+  run:        immediate
 }
 
 export const normalizeCtx = (...ctxs: TSpawnCtx[]): TSpawnCtxNormalized => assign({
diff --git a/src/main/ts/util.ts b/src/main/ts/util.ts
index 63745a3..977cf47 100644
--- a/src/main/ts/util.ts
+++ b/src/main/ts/util.ts
@@ -4,6 +4,8 @@ import { Buffer } from 'node:buffer'
 
 export const g = (!process.versions.deno && global) || globalThis
 
+export const immediate = g.setImmediate || ((f: any) => g.setTimeout(f, 0))
+
 export const noop = () => { /* noop */ }
 
 export const randomId = () => Math.random().toString(36).slice(2)
diff --git a/src/test/smoke/invoke.test.mjs b/src/test/smoke/invoke.test.mjs
index 1fed14b..6a35c04 100644
--- a/src/test/smoke/invoke.test.mjs
+++ b/src/test/smoke/invoke.test.mjs
@@ -1,4 +1,5 @@
 import assert from 'node:assert'
+import process from 'node:process'
 import { zurk, $ } from '../../../target/esm/index.mjs'
 
 const keepAlive = setInterval(() => {}, 1000 * 60 * 60)