diff --git a/sys/sys/signal.h b/sys/sys/signal.h
index f78f41f9764..1f917a296f6 100644
--- a/sys/sys/signal.h
+++ b/sys/sys/signal.h
@@ -326,6 +326,7 @@ struct sigaction {
 #endif
 
 #if __POSIX_VISIBLE || __XSI_VISIBLE
+#define	SI_NOINFO	0		/* No signal info besides si_signo. */
 #define	SI_USER		0x10001		/* Signal sent by kill(). */
 #define	SI_QUEUE	0x10002		/* Signal sent by the sigqueue(). */
 #define	SI_TIMER	0x10003		/* Signal generated by expiration of */
@@ -334,7 +335,6 @@ struct sigaction {
 					/* an asynchronous I/O request.*/
 #define	SI_MESGQ	0x10005		/* Signal generated by arrival of a */
 					/* message on an empty message queue. */
-#define	SI_KERNEL	0x10006		/* Normal signal is sent by kernel. */
 #endif
 #if __BSD_VISIBLE
 #define	SI_UNDEFINED	0