diff --git a/test/parallel/test-buffer-write.js b/test/parallel/test-buffer-write.js
index 1f080add08451f..2038bc46b74ed9 100644
--- a/test/parallel/test-buffer-write.js
+++ b/test/parallel/test-buffer-write.js
@@ -90,6 +90,8 @@ for (let i = 1; i < 4; i++) {
 const z = Buffer.alloc(4, 0);
 assert.strictEqual(z.write('\u0001', 3, 'ucs2'), 0);
 assert.strictEqual(Buffer.compare(z, Buffer.alloc(4, 0)), 0);
+// Make sure longer strings are written up to the buffer end.
+assert.strictEqual(z.write('abcd', 2), 2);
 
 // Large overrun could corrupt the process
 assert.strictEqual(Buffer.alloc(4)