diff --git a/Parser/parser.h b/Parser/parser.h
index 0763312..b025a50 100644
--- a/Parser/parser.h
+++ b/Parser/parser.h
@@ -1,3 +1,9 @@
+#ifndef Py_PARSER_H
+#define Py_PARSER_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /***********************************************************
 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
 Amsterdam, The Netherlands.
@@ -48,3 +54,8 @@
 void delparser PROTO((parser_state *ps));
 int addtoken PROTO((parser_state *ps, int type, char *str, int lineno));
 void addaccelerators PROTO((grammar *g));
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_PARSER_H */