@@ -19,13 +19,14 @@
 
 OF_ASSUME_NONNULL_BEGIN
 
 @class OFMapTable;
 
+OF_SUBCLASSING_RESTRICTED
 @interface OFEpollKernelEventObserver: OFKernelEventObserver
 {
 	int _epfd;
 	OFMapTable *_FDToEvents;
 }
 @end
 
 OF_ASSUME_NONNULL_END