diff --git a/tests/regressiontests/csrf_tests/tests.py b/tests/regressiontests/csrf_tests/tests.py
index f2fb409076..6e6c87a112 100644
--- a/tests/regressiontests/csrf_tests/tests.py
+++ b/tests/regressiontests/csrf_tests/tests.py
@@ -43,7 +43,7 @@ class TestingHttpRequest(HttpRequest):
     more easily
     """
     def is_secure(self):
-        return getattr(self, '_is_secure', False)
+        return getattr(self, '_is_secure_override', False)
 
 class CsrfViewMiddlewareTest(TestCase):
     # The csrf token is potentially from an untrusted source, so could have
@@ -259,7 +259,7 @@ class CsrfViewMiddlewareTest(TestCase):
         Test that a POST HTTPS request with a bad referer is rejected
         """
         req = self._get_POST_request_with_token()
-        req._is_secure = True
+        req._is_secure_override = True
         req.META['HTTP_HOST'] = 'www.example.com'
         req.META['HTTP_REFERER'] = 'https://www.evil.org/somepage'
         req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
@@ -271,7 +271,7 @@ class CsrfViewMiddlewareTest(TestCase):
         Test that a POST HTTPS request with a good referer is accepted
         """
         req = self._get_POST_request_with_token()
-        req._is_secure = True
+        req._is_secure_override = True
         req.META['HTTP_HOST'] = 'www.example.com'
         req.META['HTTP_REFERER'] = 'https://www.example.com/somepage'
         req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})
@@ -284,7 +284,7 @@ class CsrfViewMiddlewareTest(TestCase):
         """
         # See ticket #15617
         req = self._get_POST_request_with_token()
-        req._is_secure = True
+        req._is_secure_override = True
         req.META['HTTP_HOST'] = 'www.example.com'
         req.META['HTTP_REFERER'] = 'https://www.example.com'
         req2 = CsrfViewMiddleware().process_view(req, post_form_view, (), {})