@@ -19,14 +19,15 @@
 
 OF_ASSUME_NONNULL_BEGIN
 
 @class OFMutableData;
 
+OF_SUBCLASSING_RESTRICTED
 @interface OFPollKernelEventObserver: OFKernelEventObserver
 {
 	OFMutableData *_FDs;
 	int _maxFD;
 	id __unsafe_unretained *_FDToObject;
 }
 @end
 
 OF_ASSUME_NONNULL_END