diff --git a/benchmark/http_simple_auto.js b/benchmark/http_simple_auto.js
index 71299f90392ee8..8ac878a07646ed 100644
--- a/benchmark/http_simple_auto.js
+++ b/benchmark/http_simple_auto.js
@@ -13,7 +13,7 @@ var spawn = require('child_process').spawn;
 
 var port = parseInt(process.env.PORT || 8000);
 
-var fixed = "C".repeat(20 * 1024);
+var fixed = 'C'.repeat(20 * 1024);
 
 var stored = {};
 var storedBuffer = {};
@@ -26,13 +26,14 @@ var server = http.createServer(function(req, res) {
   var n_chunks = parseInt(commands[3], 10);
   var status = 200;
   var n;
+  var i;
 
   if (command == 'bytes') {
     n = parseInt(arg, 10);
     if (n <= 0)
       throw new Error('bytes called with n <= 0');
     if (stored[n] === undefined) {
-      stored[n] = "C".repeat(n);
+      stored[n] = 'C'.repeat(n);
     }
     body = stored[n];