diff --git a/lib/internal/fs/streams.js b/lib/internal/fs/streams.js
index 210c1ad1ae1a8c..1ef52333a8bda9 100644
--- a/lib/internal/fs/streams.js
+++ b/lib/internal/fs/streams.js
@@ -337,7 +337,7 @@ WriteStream.prototype._writev = function(data, cb) {
   const chunks = new Array(len);
   let size = 0;
 
-  for (var i = 0; i < len; i++) {
+  for (let i = 0; i < len; i++) {
     const chunk = data[i].chunk;
 
     chunks[i] = chunk;