diff --git a/Include/moduleobject.h b/Include/moduleobject.h
index bf3c4a4..b4c0cdf 100644
--- a/Include/moduleobject.h
+++ b/Include/moduleobject.h
@@ -1,3 +1,9 @@
+#ifndef Py_MODULEOBJECT_H
+#define Py_MODULEOBJECT_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /***********************************************************
 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
 Amsterdam, The Netherlands.
@@ -31,3 +37,8 @@
 extern object *newmoduleobject PROTO((char *));
 extern object *getmoduledict PROTO((object *));
 extern char *getmodulename PROTO((object *));
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_MODULEOBJECT_H */