diff --git a/lib/Acho.js b/lib/Acho.js
index 5d60d00..049c500 100644
--- a/lib/Acho.js
+++ b/lib/Acho.js
@@ -11,7 +11,7 @@ const Acho = function (opts = {}) {
 
   acho.messages = (function () {
     const messages = {}
-    for (let type in acho.types) {
+    for (const type in acho.types) {
       messages[type] =
         (opts.messages != null ? opts.messages[type] : undefined) || []
       acho[type] = acho.generateTypeMessage(type)
diff --git a/lib/Format.js b/lib/Format.js
index c476825..6c1be2a 100644
--- a/lib/Format.js
+++ b/lib/Format.js
@@ -123,9 +123,7 @@ const createFormat = opts =>
         return match
       })
       if (!isEmpty(args)) {
-        for (let arg of args) {
-          messages += ` ${serialize(arg, color)}`
-        }
+        for (const arg of args) messages += ` ${serialize(arg, color)}`
       }
     }
 
diff --git a/lib/Util.js b/lib/Util.js
index ff31770..86faa60 100644
--- a/lib/Util.js
+++ b/lib/Util.js
@@ -10,9 +10,7 @@ const getChalkColor = function (color) {
 
 const getColor = function (colors) {
   let stylize
-  for (let color of colors) {
-    stylize = getChalkColor(color)
-  }
+  for (const color of colors) stylize = getChalkColor(color)
   return stylize
 }