diff --git a/rest_framework/test.py b/rest_framework/test.py
index f2581cacc..8ab0f2de1 100644
--- a/rest_framework/test.py
+++ b/rest_framework/test.py
@@ -79,7 +79,7 @@ if requests is not None:
             """
             raw_kwargs = {}
 
-            def start_response(wsgi_status, wsgi_headers):
+            def start_response(wsgi_status, wsgi_headers, exc_info=None):
                 status, _, reason = wsgi_status.partition(' ')
                 raw_kwargs['status'] = int(status)
                 raw_kwargs['reason'] = reason