diff --git a/core/tests/unit/test_client.py b/core/tests/unit/test_client.py
index a5ae46fb609d..21a8bccc9845 100644
--- a/core/tests/unit/test_client.py
+++ b/core/tests/unit/test_client.py
@@ -53,7 +53,7 @@ def test_unpickleable(self):
         CREDENTIALS = _make_credentials()
         HTTP = object()
 
-        client_obj = self._make_one(credentials=CREDENTIALS, http=HTTP)
+        client_obj = self._make_one(credentials=CREDENTIALS, _http=HTTP)
         with self.assertRaises(pickle.PicklingError):
             pickle.dumps(client_obj)