diff --git a/test/parallel/test-buffer-zero-fill-cli.js b/test/parallel/test-buffer-zero-fill-cli.js
index 91679498a1a..2f3b243c470 100644
--- a/test/parallel/test-buffer-zero-fill-cli.js
+++ b/test/parallel/test-buffer-zero-fill-cli.js
@@ -9,8 +9,8 @@ const SlowBuffer = require('buffer').SlowBuffer;
 const assert = require('assert');
 
 function isZeroFilled(buf) {
-  for (let n = 0; n < buf.length; n++)
-    if (buf[n] > 0) return false;
+  for (const n of buf)
+    if (n > 0) return false;
   return true;
 }