diff --git a/lib/middleware.js b/lib/middleware.js
index 2ae9d25..89e3e30 100644
--- a/lib/middleware.js
+++ b/lib/middleware.js
@@ -143,7 +143,7 @@ exports.parted = exports.Parted = function(nextApp, opts) {
         fn(req, null, function() {
             Q.when(nextApp(req), function(resp) {
                 deferred.resolve(resp);
-            });
+            }, deferred.reject);
         });
 
         return deferred.promise;