diff --git a/lib/web/auth/saml/index.js b/lib/web/auth/saml/index.js
index 9d65339f..575e2e47 100644
--- a/lib/web/auth/saml/index.js
+++ b/lib/web/auth/saml/index.js
@@ -10,7 +10,7 @@ const { urlencodedParser } = require('../../utils')
 const fs = require('fs')
 const intersection = function (array1, array2) { return array1.filter((n) => array2.includes(n)) }
 
-let samlAuth = module.exports = Router()
+const samlAuth = module.exports = Router()
 
 passport.use(new SamlStrategy({
   callbackUrl: config.serverURL + '/auth/saml/callback',