diff --git a/src/install.ts b/src/install.ts
index f777f06..050cf48 100644
--- a/src/install.ts
+++ b/src/install.ts
@@ -74,7 +74,7 @@ class UI {
   }
 
   localize(message: string, ...args: Array<string | number | boolean>) {
-    let ret = message;
+    const ret = message;
     for (const i in args) {
       ret.replace(`{${i}}`, args[i].toString());
     }