diff --git a/Modules/selectmodule.c b/Modules/selectmodule.c
index 0855375..d40e8b5 100644
--- a/Modules/selectmodule.c
+++ b/Modules/selectmodule.c
@@ -1764,7 +1764,9 @@
 	Py_INCREF(SelectError);
 	PyModule_AddObject(m, "error", SelectError);
 
+#ifdef PIPE_BUF
 	PyModule_AddIntConstant(m, "PIPE_BUF", PIPE_BUF);
+#endif
 
 #if defined(HAVE_POLL)
 #ifdef __APPLE__