Added declaration for *PyMarshal_WriteObjectToString().
diff --git a/Include/marshal.h b/Include/marshal.h
index 55396d5..cee1720 100644
--- a/Include/marshal.h
+++ b/Include/marshal.h
@@ -33,6 +33,7 @@
void PyMarshal_WriteLongToFile Py_PROTO((long, FILE *));
void PyMarshal_WriteShortToFile Py_PROTO((int, FILE *));
void PyMarshal_WriteObjectToFile Py_PROTO((PyObject *, FILE *));
+PyObject *PyMarshal_WriteObjectToString Py_PROTO((PyObject *));
long PyMarshal_ReadLongFromFile Py_PROTO((FILE *));
int PyMarshal_ReadShortFromFile Py_PROTO((FILE *));