diff --git a/back/models/agency-workCenter.js b/back/models/agency-workCenter.js
index 3220999e95..32114355e8 100644
--- a/back/models/agency-workCenter.js
+++ b/back/models/agency-workCenter.js
@@ -1,4 +1,4 @@
-let UserError = require('vn-loopback/util/user-error');
+const UserError = require('vn-loopback/util/user-error');
 module.exports = Self => {
     Self.rewriteDbError(function(err) {
         if (err.code === 'ER_DUP_ENTRY')