diff --git a/Parser/parser.h b/Parser/parser.h
index 95ec247..f5d2d0d 100644
--- a/Parser/parser.h
+++ b/Parser/parser.h
@@ -25,8 +25,8 @@
 	stack	 	p_stack;	/* Stack of parser states */
 	grammar		*p_grammar;	/* Grammar to use */
 	node		*p_tree;	/* Top of parse tree */
-#if 0 /* future keyword */
-	int		p_generators;	/* 1 if yield is a keyword */
+#ifdef PY_PARSER_REQUIRES_FUTURE_KEYWORD
+	unsigned long	p_flags;	/* see co_flags in Include/code.h */
 #endif
 } parser_state;