diff --git a/test/parallel/test-stream-duplex.js b/test/parallel/test-stream-duplex.js
index 3760960ac9346c..0b71b3d9a50569 100644
--- a/test/parallel/test-stream-duplex.js
+++ b/test/parallel/test-stream-duplex.js
@@ -5,27 +5,28 @@ const Duplex = require('stream').Transform;
 
 const stream = new Duplex({ objectMode: true });
 
+assert(Duplex() instanceof Duplex);
 assert(stream._readableState.objectMode);
 assert(stream._writableState.objectMode);
 
 let written;
 let read;
 
-stream._write = function(obj, _, cb) {
+stream._write = (obj, _, cb) => {
   written = obj;
   cb();
 };
 
-stream._read = function() {};
+stream._read = () => {};
 
-stream.on('data', function(obj) {
+stream.on('data', (obj) => {
   read = obj;
 });
 
 stream.push({ val: 1 });
 stream.end({ val: 2 });
 
-process.on('exit', function() {
-  assert(read.val === 1);
-  assert(written.val === 2);
+process.on('exit', () => {
+  assert.strictEqual(read.val, 1);
+  assert.strictEqual(written.val, 2);
 });