2 files changed, 1 insertions, 4 deletions
diff --git a/Misc/NEWS b/Misc/NEWS
index f47113c..74096c0 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -47,9 +47,6 @@ Core and builtins
 - obj.__contains__() now returns True/False instead of 1/0.  SF patch
   820195.
 
-- builtin_sum() now uses PyNumber_InPlaceAdd, fixing a previous
-  performance bug for sum(list_of_lists) and similar cases.
-
 Extension modules
 -----------------
 
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 718b603..0309f1de 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -1840,7 +1840,7 @@ builtin_sum(PyObject *self, PyObject *args)
 			}
 			break;
 		}
-		temp = PyNumber_InPlaceAdd(result, item);
+		temp = PyNumber_Add(result, item);
 		Py_DECREF(result);
 		Py_DECREF(item);
 		result = temp;