diff --git a/usr/include/sys/socket.h b/usr/include/sys/socket.h
index 38cfef6..3334212 100644
--- a/usr/include/sys/socket.h
+++ b/usr/include/sys/socket.h
@@ -32,6 +32,9 @@
 # define SOCK_NONBLOCK  04000
 #endif
 
+/* The maximum backlock queue length. */
+#define SOMAXCONN	128
+
 #ifndef AF_INET
 #define AF_UNSPEC	0
 #define AF_UNIX		1	/* Unix domain sockets 		*/