diff --git a/test/parallel/test-intl-no-icu-data.js b/test/parallel/test-intl-no-icu-data.js
index ce5e9a0812..695a4698b5 100644
--- a/test/parallel/test-intl-no-icu-data.js
+++ b/test/parallel/test-intl-no-icu-data.js
@@ -4,6 +4,5 @@ require('../common');
 const assert = require('assert');
 const config = process.binding('config');
 
-// No-op when ICU case mappings are unavailable.
-assert.strictEqual('ç'.toLocaleUpperCase('el'), 'ç');
+assert.deepStrictEqual(Intl.NumberFormat.supportedLocalesOf('en'), []);
 assert.strictEqual(config.icuDataDir, 'test/fixtures/empty/');