diff --git a/newlib/libc/sys/rtems/include/sys/poll.h b/newlib/libc/sys/rtems/include/sys/poll.h
index 7cdbbbb59..cc6ad49db 100644
--- a/newlib/libc/sys/rtems/include/sys/poll.h
+++ b/newlib/libc/sys/rtems/include/sys/poll.h
@@ -71,6 +71,7 @@ struct pollfd {
 #if __BSD_VISIBLE
 /* General FreeBSD extension (currently only supported for sockets): */
 #define	POLLINIGNEOF	0x2000		/* like POLLIN, except ignore EOF */
+#define	POLLRDHUP	0x4000		/* half shut down */
 #endif
 
 /*