@@ -24,12 +24,16 @@
 #ifdef HAVE_SYS_SELECT_H
 # include <sys/select.h>
 #endif
 
 #import "OFKernelEventObserver.h"
+
+OF_ASSUME_NONNULL_BEGIN
 
 @interface OFKernelEventObserver_select: OFKernelEventObserver
 {
 	fd_set _readFDs, _writeFDs;
 	int _maxFD;
 }
 @end
+
+OF_ASSUME_NONNULL_END