diff --git a/include/linux/net.h b/include/linux/net.h
index 94de83c0..1da55e9 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -42,6 +42,7 @@
 #define SYS_RECVMSG	17		/* sys_recvmsg(2)		*/
 #define SYS_ACCEPT4	18		/* sys_accept4(2)		*/
 #define SYS_RECVMMSG	19		/* sys_recvmmsg(2)		*/
+#define SYS_SENDMMSG	20		/* sys_sendmmsg(2)		*/
 
 typedef enum {
 	SS_FREE = 0,			/* not allocated		*/