diff --git a/headers/posix/poll.h b/headers/posix/poll.h
index 945dd447e3..0b186a1e3b 100644
--- a/headers/posix/poll.h
+++ b/headers/posix/poll.h
@@ -12,19 +12,19 @@ struct pollfd {
 	int revents;	/* events that occured */
 };
 
-/* events & revents */
+/* events & revents - compatible with the B_SELECT_xxx definitions in Drivers.h */
 #define	POLLIN		0x0001		/* any readable data available */
-#define	POLLPRI		0x0002		/* high priority readable data */
-#define	POLLOUT		0x0004		/* file descriptor is writeable */
-#define	POLLRDNORM	0x0040		/* normal data available */
-#define	POLLRDBAND	0x0080		/* priority readable data */
+#define	POLLOUT		0x0002		/* file descriptor is writeable */
+#define	POLLRDNORM	POLLIN
 #define	POLLWRNORM	POLLOUT
-#define	POLLWRBAND	0x0100		/* priority data can be written */
+#define	POLLRDBAND	0x0008		/* priority readable data */
+#define	POLLWRBAND	0x0010		/* priority data can be written */
+#define	POLLPRI		0x0020		/* high priority readable data */
 
 /* revents only */
-#define	POLLERR		0x0008		/* errors pending */
-#define	POLLHUP		0x0010		/* disconnected */
-#define	POLLNVAL	0x0020		/* invalid file descriptor */
+#define	POLLERR		0x0004		/* errors pending */
+#define	POLLHUP		0x0080		/* disconnected */
+#define	POLLNVAL	0x1000		/* invalid file descriptor */
 
 
 extern