diff --git a/test/fixtures/spawn-worker-with-copied-env.js b/test/fixtures/spawn-worker-with-copied-env.js
index 51e64bd8755b6d..f33f86fcc6fe7c 100644
--- a/test/fixtures/spawn-worker-with-copied-env.js
+++ b/test/fixtures/spawn-worker-with-copied-env.js
@@ -2,7 +2,7 @@
 
 // This test is meant to be spawned with NODE_OPTIONS=--title=foo
 const assert = require('assert');
-if (process.platform !== 'sunos') {  // --title is unsupported on SmartOS.
+if (process.platform !== 'sunos' && process.platform !== 'os400') {  // --title is unsupported on SmartOS and IBM i.
   assert.strictEqual(process.title, 'foo');
 }