@@ -67,15 +67,12 @@
  *	 use @ref OFSPXSocket instead.
  *
  * To connect to a server, create a socket and connect it.
  * To create a server, create a socket, bind it and listen on it.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFSPXStreamSocket: OFStreamSocket
-{
-	OF_RESERVE_IVARS(OFSPXStreamSocket, 4)
-}
-
 /**
  * @brief The delegate for asynchronous operations on the socket.
  *
  * @note The delegate is retained for as long as asynchronous operations are
  *	 still ongoing.