diff --git a/src/milla/controller.py b/src/milla/controller.py
index fba6368..66d2da1 100644
--- a/src/milla/controller.py
+++ b/src/milla/controller.py
@@ -21,5 +21,8 @@ class Controller(object):
         except webob.exc.WSGIHTTPException as e:
             return e(environ, start_response)
 
+        if isinstance(response, basestring):
+            response = webob.Response(response)
+
         start_response(response.status, response.headerlist)
         return response.app_iter