diff --git a/src/moto/ajax.js b/src/moto/ajax.js
index 39780439..23a76728 100644
--- a/src/moto/ajax.js
+++ b/src/moto/ajax.js
@@ -7,7 +7,7 @@ function rnd() {
 }
 
 const KEY = "moto-ajax";
-const MOID = local.getItem(KEY) || (Date.now().toString(36)+rnd()+rnd());
+let MOID = local.getItem(KEY) || (Date.now().toString(36)+rnd()+rnd());
 
 local.setItem(KEY, MOID);