corrected two unconverted names
diff --git a/Include/classobject.h b/Include/classobject.h
index 9c4bc51..9810009 100644
--- a/Include/classobject.h
+++ b/Include/classobject.h
@@ -71,7 +71,7 @@
 
 extern int PyClass_IsSubclass Py_PROTO((PyObject *, PyObject *));
 
-extern PyObject *instancebinop
+extern PyObject *PyInstance_DoBinOp
 	Py_PROTO((PyObject *, PyObject *,
 		  char *, char *,
 		  PyObject * (*) Py_PROTO((PyObject *, PyObject *)) ));