diff --git a/Kernel/API/POSIX/sys/socket.h b/Kernel/API/POSIX/sys/socket.h
index bdd5d3328b..750a353a41 100644
--- a/Kernel/API/POSIX/sys/socket.h
+++ b/Kernel/API/POSIX/sys/socket.h
@@ -118,6 +118,8 @@ enum {
     SO_ACCEPTCONN,
     SO_DONTROUTE,
     SO_OOBINLINE,
+    SO_SNDLOWAT,
+    SO_RCVLOWAT,
 };
 #define SO_RCVTIMEO SO_RCVTIMEO
 #define SO_SNDTIMEO SO_SNDTIMEO
@@ -136,6 +138,8 @@ enum {
 #define SO_ACCEPTCONN SO_ACCEPTCONN
 #define SO_DONTROUTE SO_DONTROUTE
 #define SO_OOBINLINE SO_OOBINLINE
+#define SO_SNDLOWAT SO_SNDLOWAT
+#define SO_RCVLOWAT SO_RCVLOWAT
 
 enum {
     SCM_TIMESTAMP,