diff --git a/lib/internal/streams/buffer_list.js b/lib/internal/streams/buffer_list.js
index 715d5d201d4df4..5e23f2cf464f6c 100644
--- a/lib/internal/streams/buffer_list.js
+++ b/lib/internal/streams/buffer_list.js
@@ -48,8 +48,8 @@ module.exports = class BufferList {
   join(s) {
     if (this.length === 0)
       return '';
-    var p = this.head;
-    var ret = '' + p.data;
+    let p = this.head;
+    let ret = '' + p.data;
     while (p = p.next)
       ret += s + p.data;
     return ret;
@@ -59,8 +59,8 @@ module.exports = class BufferList {
     if (this.length === 0)
       return Buffer.alloc(0);
     const ret = Buffer.allocUnsafe(n >>> 0);
-    var p = this.head;
-    var i = 0;
+    let p = this.head;
+    let i = 0;
     while (p) {
       ret.set(p.data, i);
       i += p.data.length;
diff --git a/lib/internal/streams/legacy.js b/lib/internal/streams/legacy.js
index 06e48e8b15d839..062eabec3890c0 100644
--- a/lib/internal/streams/legacy.js
+++ b/lib/internal/streams/legacy.js
@@ -36,7 +36,7 @@ Stream.prototype.pipe = function(dest, options) {
     source.on('close', onclose);
   }
 
-  var didOnEnd = false;
+  let didOnEnd = false;
   function onend() {
     if (didOnEnd) return;
     didOnEnd = true;