diff --git a/Objects/fileobject.c b/Objects/fileobject.c
index 77724d4..ff30745 100644
--- a/Objects/fileobject.c
+++ b/Objects/fileobject.c
@@ -2254,7 +2254,7 @@
 		Py_DECREF(closeresult);
 	}
 
-#ifdef Py_WIN_WIDE_FILENAMES
+#ifdef MS_WINDOWS
 	if (GetVersion() < 0x80000000) {    /* On NT, so wide API available */
 		PyObject *po;
 		if (PyArg_ParseTupleAndKeywords(args, kwds, "U|si:file",