PEP 3101: Completed string.Formatter class.  Reimplemented field_name to object transformation.
diff --git a/Include/unicodeobject.h b/Include/unicodeobject.h
index f940887..bc94a53 100644
--- a/Include/unicodeobject.h
+++ b/Include/unicodeobject.h
@@ -1440,8 +1440,7 @@
 PyObject *
 _unicodeformatter_iterator(PyObject *str);
 PyObject *
-_unicodeformatter_lookup(PyObject *field_name, PyObject *args,
-                         PyObject *kwargs);
+_unicodeformatter_field_name_split(PyObject *field_name);
 
 #ifdef __cplusplus
 }