diff --git a/lib/isc/include/isc/socket.h b/lib/isc/include/isc/socket.h
index d43af29f68..c1f05f7c51 100644
--- a/lib/isc/include/isc/socket.h
+++ b/lib/isc/include/isc/socket.h
@@ -114,10 +114,10 @@ struct isc_socket_connev {
 	ISC_EVENT_COMMON(isc_socket_connev_t);
 	isc_result_t		result;		/* OK, EOF, whatever else */
 };
-
-#define ISC_SOCKEVENTATTR_TRUNC			0x8000000U
-#define ISC_SOCKEVENTATTR_CTRUNC		0x4000000U
-#define ISC_SOCKEVENTATTR_TIMESTAMP		0x2000000U
+#define ISC_SOCKEVENTATTR_ATTACHED		0x8000000U /* internal */
+#define ISC_SOCKEVENTATTR_TRUNC			0x0080000U /* public */
+#define ISC_SOCKEVENTATTR_CTRUNC		0x0040000U /* public */
+#define ISC_SOCKEVENTATTR_TIMESTAMP		0x0020000U /* public */
 
 #define ISC_SOCKEVENT_ANYEVENT  (0)
 #define ISC_SOCKEVENT_RECVDONE	(ISC_EVENTCLASS_SOCKET + 1)
diff --git a/lib/isc/unix/socket.c b/lib/isc/unix/socket.c
index 12b0c3fb56..156ec8e39b 100644
--- a/lib/isc/unix/socket.c
+++ b/lib/isc/unix/socket.c
@@ -1990,8 +1990,8 @@ isc_socket_sendto(isc_socket_t *sock, isc_region_t *region,
 	if (!was_empty)
 		goto queue;
 
-	build_msghdr_send(sock, dev, &msghdr,
-			  iov, ISC_SOCKET_MAXSCATTERGATHER, &write_count);
+	build_msghdr_send(sock, dev, &msghdr, iov,
+			  ISC_SOCKET_MAXSCATTERGATHER, &write_count);
 
 	cc = sendmsg(sock->fd, &msghdr, 0);