diff --git a/lib/web/auth/email/index.js b/lib/web/auth/email/index.js
index 7c812d69..ce26931a 100644
--- a/lib/web/auth/email/index.js
+++ b/lib/web/auth/email/index.js
@@ -11,7 +11,7 @@ const { setReturnToFromReferer } = require('../utils')
 const { urlencodedParser } = require('../../utils')
 const response = require('../../../response')
 
-let emailAuth = module.exports = Router()
+const emailAuth = module.exports = Router()
 
 passport.use(new LocalStrategy({
   usernameField: 'email'