diff --git a/Include/object.h b/Include/object.h
index 4ab8fde7dfa..f2a83d79709 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -273,6 +273,7 @@ extern long PyObject_Hash Py_PROTO((PyObject *));
 extern int PyObject_IsTrue Py_PROTO((PyObject *));
 extern int PyCallable_Check Py_PROTO((PyObject *));
 extern int PyNumber_Coerce Py_PROTO((PyObject **, PyObject **));
+extern int PyNumber_CoerceEx Py_PROTO((PyObject **, PyObject **));
 
 /* Flag bits for printing: */
 #define Py_PRINT_RAW	1	/* No string quotes etc. */