diff --git a/benchmark/common.js b/benchmark/common.js
index d2103704ab2838..701a8d6c34f07f 100644
--- a/benchmark/common.js
+++ b/benchmark/common.js
@@ -268,7 +268,7 @@ function formatResult(data) {
     conf += ` ${key}=${JSON.stringify(data.conf[key])}`;
   }
 
-  var rate = data.rate.toString().split('.');
+  let rate = data.rate.toString().split('.');
   rate[0] = rate[0].replace(/(\d)(?=(?:\d\d\d)+(?!\d))/g, '$1,');
   rate = (rate[1] ? rate.join('.') : rate[0]);
   return `${data.name}${conf}: ${rate}`;