Index: sys/kern/sys_socket.c
===================================================================
--- sys/kern/sys_socket.c
+++ sys/kern/sys_socket.c
@@ -604,6 +604,8 @@
 		if (td->td_ru.ru_msgrcv != ru_before)
 			job->msgrcv = 1;
 	} else {
+		if (!TAILQ_EMPTY(&sb->sb_aiojobq))
+			flags |= MSG_MORETOCOME;
 		uio.uio_rw = UIO_WRITE;
 		ru_before = td->td_ru.ru_msgsnd;
 #ifdef MAC
Index: sys/kern/uipc_socket.c
===================================================================
--- sys/kern/uipc_socket.c
+++ sys/kern/uipc_socket.c
@@ -1182,6 +1182,7 @@
 	     (resid <= 0)) ?
 		PRUS_EOF :
 		/* If there is more to send set PRUS_MORETOCOME */
+		(flags & MSG_MORETOCOME) ||
 		(resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
 		top, addr, control, td);
 	if (dontroute) {
@@ -1368,6 +1369,7 @@
 			     (resid <= 0)) ?
 				PRUS_EOF :
 			/* If there is more to send set PRUS_MORETOCOME. */
+			    (flags & MSG_MORETOCOME) ||
 			    (resid > 0 && space > 0) ? PRUS_MORETOCOME : 0,
 			    top, addr, control, td);
 			if (dontroute) {
Index: sys/sys/socket.h
===================================================================
--- sys/sys/socket.h
+++ sys/sys/socket.h
@@ -435,6 +435,7 @@
 #endif
 #ifdef _KERNEL
 #define	MSG_SOCALLBCK   0x10000		/* for use by socket callbacks - soreceive (TCP) */
+#define	MSG_MORETOCOME	0x20000		/* additional data pending */
 #endif
 
 /*