diff --git a/debug_toolbar/middleware.py b/debug_toolbar/middleware.py
index d24bcaf5c..af898f1a4 100644
--- a/debug_toolbar/middleware.py
+++ b/debug_toolbar/middleware.py
@@ -84,6 +84,8 @@ def process_request(self, request):
                 new_urlconf.urlpatterns = debug_toolbar.urls.urlpatterns + \
                         list(urlconf.urlpatterns)
 
+                if hasattr(urlconf, 'handler403'):
+                    new_urlconf.handler403 = urlconf.handler403
                 if hasattr(urlconf, 'handler404'):
                     new_urlconf.handler404 = urlconf.handler404
                 if hasattr(urlconf, 'handler500'):