diff --git a/spec/fixtures/api/utility-process/log.js b/spec/fixtures/api/utility-process/log.js
index 87a0ceafdfab..209afeedbce2 100644
--- a/spec/fixtures/api/utility-process/log.js
+++ b/spec/fixtures/api/utility-process/log.js
@@ -1,3 +1,7 @@
-console.log('hello');
-process.stderr.write('world');
-process.exit(0);
+function write (writable, chunk) {
+  return new Promise((resolve) => writable.write(chunk, resolve));
+}
+
+write(process.stdout, 'hello\n')
+  .then(() => write(process.stderr, 'world'))
+  .then(() => process.exit(0));