diff --git a/lib/index.js b/lib/index.js
index 31946eed..c30bef4c 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -124,6 +124,7 @@ module.exports = function(options) {
   };
 
   middleware.unless = unless;
+  middleware.UnauthorizedError = UnauthorizedError;
 
   return middleware;
 };