diff --git a/lib/fs.js b/lib/fs.js
index a435470fa71401..82e3483b972271 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -1408,7 +1408,7 @@ if (isWindows) {
   };
 } else {
   splitRoot = function splitRoot(str) {
-    for (var i = 0; i < str.length; ++i) {
+    for (let i = 0; i < str.length; ++i) {
       if (str.charCodeAt(i) !== CHAR_FORWARD_SLASH)
         return str.slice(0, i);
     }