@@ -19,15 +19,10 @@
 #import "socket.h"
 
 OF_ASSUME_NONNULL_BEGIN
 
 @class OFMutableArray OF_GENERIC(ObjectType);
-@class OFMutableDictionary OF_GENERIC(KeyType, ObjectType);
-@class OFDataArray;
-#ifdef OF_HAVE_THREADS
-@class OFMutex;
-#endif
 @class OFDate;
 
 /*!
  * @protocol OFKernelEventObserverDelegate
  *	     OFKernelEventObserver.h ObjFW/OFKernelEventObserver.h
@@ -110,22 +105,17 @@
 {
 	OFMutableArray OF_GENERIC(id <OFReadyForReadingObserving>)
 	    *_readObjects;
 	OFMutableArray OF_GENERIC(id <OFReadyForWritingObserving>)
 	    *_writeObjects;
-	OFMutableArray *_queue;
-	OFDataArray *_queueActions;
 	id <OFKernelEventObserverDelegate> _delegate;
 #ifdef OF_HAVE_PIPE
 	int _cancelFD[2];
 #else
 	of_socket_t _cancelFD[2];
 	struct sockaddr_in _cancelAddr;
 #endif
-#ifdef OF_HAVE_THREADS
-	OFMutex *_mutex;
-#endif
 }
 
 /*!
  * The delegate for the OFKernelEventObserver.
  */