@@ -34,13 +34,11 @@
  *
  * @brief A protocol that needs to be implemented by delegates for
  *	  OFKernelEventObserver.
  */
 @protocol OFKernelEventObserverDelegate <OFObject>
-#ifdef OF_HAVE_OPTIONAL_PROTOCOLS
 @optional
-#endif
 /*!
  * @brief This callback is called when an object did get ready for reading.
  *
  * @note If the object is a subclass of @ref OFStream and
  *	 @ref OFStream::tryReadLine or @ref OFStream::tryReadTillDelimiter: has
@@ -213,10 +211,6 @@
  * manually stop the observe running in another thread.
  */
 - (void)cancel;
 @end
 
-@interface OFObject (OFKernelEventObserverDelegate)
-    <OFKernelEventObserverDelegate>
-@end
-
 OF_ASSUME_NONNULL_END