Rename _Py_identifier to _Py_IDENTIFIER.
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index c6b89f3..acb0097 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -122,7 +122,7 @@
 static PyObject *
 fileio_close(fileio *self)
 {
-    _Py_identifier(close);
+    _Py_IDENTIFIER(close);
     if (!self->closefd) {
         self->fd = -1;
         Py_RETURN_NONE;