diff --git a/headers/posix/sys/socket.h b/headers/posix/sys/socket.h
index a0928e7288..2766b588e3 100644
--- a/headers/posix/sys/socket.h
+++ b/headers/posix/sys/socket.h
@@ -184,7 +184,7 @@ int     setsockopt(int socket, int level, int option, const void *value,
 			socklen_t length);
 int		shutdown(int socket, int how);
 int		socket(int domain, int type, int protocol);
-int		sockatmark(int socket);
+int		sockatmark(int );
 int		socketpair(int domain, int type, int protocol, int socketVector[2]);
 
 #if __cplusplus