diff --git a/src/index.js b/src/index.js
index ba424e9..28a00ef 100644
--- a/src/index.js
+++ b/src/index.js
@@ -12,7 +12,7 @@ const bahtxtConst = {
 function bahtxtNum2Word (nums) {
   let result = ''
   const len = nums.length
-  const maxLen = 7
+  let maxLen = 7 
 
   if (len > maxLen) {
     // more than million