diff --git a/src/main/ts/spawn.ts b/src/main/ts/spawn.ts
index 9792de8..7c787b4 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 } from './util.js'
+import { assign, noop, randomId, g } 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:        setImmediate,
+  run:        g.setImmediate,
 }
 
 export const normalizeCtx = (...ctxs: TSpawnCtx[]): TSpawnCtxNormalized => assign({
diff --git a/src/main/ts/util.ts b/src/main/ts/util.ts
index 20769e6..d5fc326 100644
--- a/src/main/ts/util.ts
+++ b/src/main/ts/util.ts
@@ -1,5 +1,7 @@
 import { Stream } from 'node:stream'
 
+export const g = global || globalThis
+
 export const noop = () => { /* noop */ }
 
 export const randomId = () => Math.random().toString(36).slice(2)
diff --git a/src/main/ts/x.ts b/src/main/ts/x.ts
index fb5e81b..065f5f3 100644
--- a/src/main/ts/x.ts
+++ b/src/main/ts/x.ts
@@ -17,7 +17,8 @@ import {
   assign,
   quote,
   buildCmd,
-  parseInput
+  parseInput,
+  g
 } from './util.js'
 import { pipeMixin } from './mixin/pipe.js'
 import { killMixin } from './mixin/kill.js'
@@ -85,8 +86,6 @@ export interface TShellSync {
   (opts: TShellOptions): TShellSync
 }
 
-const g = global || globalThis
-
 export const $: TShell = function(this: any, pieces?: any, ...args: any): any {
   const self =  (this !== g) && this
   const preset = self || {}
diff --git a/src/test/smoke/invoke.test.mjs b/src/test/smoke/invoke.test.mjs
index 1fed14b..1f3ff57 100644
--- a/src/test/smoke/invoke.test.mjs
+++ b/src/test/smoke/invoke.test.mjs
@@ -1,6 +1,10 @@
 import assert from 'node:assert'
 import { zurk, $ } from '../../../target/esm/index.mjs'
 
+if (globalThis.Deno) {
+  globalThis.setImmediate = (cb) => setTimeout(cb, 0)
+  globalThis.global = globalThis
+}
 const keepAlive = setInterval(() => {}, 1000 * 60 * 60)
 
 const r1 = zurk({ sync: true, cmd: 'echo', args: ['foo'] })