@@ -37,11 +37,13 @@
 /**
  * \brief A protocol that needs to be implemented by delegates for
  *	  OFStreamObserver.
  */
 @protocol OFStreamObserverDelegate
-
+#ifdef OF_HAVE_OPTIONAL_PROTOCOLS
+@optional
+#endif
 /**
  * This callback is called when a stream did get ready for reading.
  *
  * \param stream The stream which did become ready for reading
  */