diff --git a/include/sys/socket.h b/include/sys/socket.h
index 1dec4b00..cd38a4c8 100644
--- a/include/sys/socket.h
+++ b/include/sys/socket.h
@@ -235,6 +235,8 @@ struct linger {
 #define SCM_TIMESTAMPING_PKTINFO 58
 #define SO_PEERGROUPS           59
 #define SO_ZEROCOPY             60
+#define SO_TXTIME               61
+#define SCM_TXTIME              SO_TXTIME
 
 #ifndef SOL_SOCKET
 #define SOL_SOCKET      1