diff --git a/Include/moduleobject.h b/Include/moduleobject.h
index 694343a3d98..6dada3c2d43 100644
--- a/Include/moduleobject.h
+++ b/Include/moduleobject.h
@@ -44,6 +44,7 @@ extern DL_IMPORT(PyTypeObject) PyModule_Type;
 extern DL_IMPORT(PyObject *) PyModule_New Py_PROTO((char *));
 extern DL_IMPORT(PyObject *) PyModule_GetDict Py_PROTO((PyObject *));
 extern DL_IMPORT(char *) PyModule_GetName Py_PROTO((PyObject *));
+extern DL_IMPORT(char *) PyModule_GetFilename Py_PROTO((PyObject *));
 extern DL_IMPORT(void) _PyModule_Clear Py_PROTO((PyObject *));
 
 #ifdef __cplusplus