diff --git a/Include/parsetok.h b/Include/parsetok.h
index 0f87e81..2b4ce1e 100644
--- a/Include/parsetok.h
+++ b/Include/parsetok.h
@@ -23,7 +23,9 @@
 
 #define PyPARSE_DONT_IMPLY_DEDENT	0x0002
 
+#if 0
 #define PyPARSE_WITH_IS_KEYWORD		0x0003
+#endif
 
 PyAPI_FUNC(node *) PyParser_ParseString(const char *, grammar *, int,
                                               perrdetail *);