diff --git a/Kernel/API/POSIX/sys/socket.h b/Kernel/API/POSIX/sys/socket.h
index b6ee4ac895..bdd5d3328b 100644
--- a/Kernel/API/POSIX/sys/socket.h
+++ b/Kernel/API/POSIX/sys/socket.h
@@ -61,6 +61,7 @@ extern "C" {
 #define MSG_WAITALL 0x20
 #define MSG_DONTWAIT 0x40
 #define MSG_NOSIGNAL 0x80
+#define MSG_EOR 0x100
 
 typedef uint16_t sa_family_t;