@@ -19,12 +19,13 @@
 
 OF_ASSUME_NONNULL_BEGIN
 
 @class OFMutableArray OF_GENERIC(ObjectType);
 
+OF_SUBCLASSING_RESTRICTED
 @interface OFKqueueKernelEventObserver: OFKernelEventObserver
 {
 	int _kernelQueue;
 }
 @end
 
 OF_ASSUME_NONNULL_END