diff --git a/neutron/wsgi.py b/neutron/wsgi.py
index 9cae973009..5cd6fab3c3 100644
--- a/neutron/wsgi.py
+++ b/neutron/wsgi.py
@@ -906,7 +906,7 @@ class Application(object):
           res = 'message\n'
 
           # Option 2: a nicely formatted HTTP exception page
-          res = exc.HTTPForbidden(detail='Nice try')
+          res = exc.HTTPForbidden(explanation='Nice try')
 
           # Option 3: a webob Response object (in case you need to play with
           # headers, or you want to be treated like an iterable, or or or)