diff --git a/lib/web/auth/dropbox/index.js b/lib/web/auth/dropbox/index.js
index 1cfabd29..7d02275e 100644
--- a/lib/web/auth/dropbox/index.js
+++ b/lib/web/auth/dropbox/index.js
@@ -6,7 +6,7 @@ const DropboxStrategy = require('passport-dropbox-oauth2').Strategy
 const config = require('../../../config')
 const { setReturnToFromReferer, passportGeneralCallback } = require('../utils')
 
-let dropboxAuth = module.exports = Router()
+const dropboxAuth = module.exports = Router()
 
 passport.use(new DropboxStrategy({
   apiVersion: '2',