Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -742,10 +742,12 @@
 
 	AC_CHECK_FUNC(kqueue, [
 		AC_DEFINE(HAVE_KQUEUE, 1, [Whether we have kqueue])
 		AC_SUBST(OFKERNELEVENTOBSERVER_KQUEUE_M,
 			"OFKernelEventObserver_kqueue.m")
+
+		AC_CHECK_FUNCS(kqueue1)
 	])
 	AC_CHECK_HEADER(poll.h, [
 		AC_DEFINE(HAVE_POLL_H, 1, [Whether we have poll.h])
 		AC_SUBST(OFKERNELEVENTOBSERVER_POLL_M,
 			"OFKernelEventObserver_poll.m")

Index: src/OFKernelEventObserver_kqueue.m
==================================================================
--- src/OFKernelEventObserver_kqueue.m
+++ src/OFKernelEventObserver_kqueue.m
@@ -43,13 +43,24 @@
 - init
 {
 	self = [super init];
 
 	@try {
+#ifdef HAVE_KQUEUE1
+		if ((_kernelQueue = kqueue1(O_CLOEXEC)) == -1)
+			@throw [OFInitializationFailedException
+			    exceptionWithClass: [self class]];
+#else
+		int flags;
+
 		if ((_kernelQueue = kqueue()) == -1)
 			@throw [OFInitializationFailedException
 			    exceptionWithClass: [self class]];
+
+		if ((flags = fcntl(_kernelQueue, F_GETFD, 0)) != -1)
+			fcntl(_kernelQueue, F_SETFD, flags | FD_CLOEXEC);
+#endif
 
 		_changeList = [[OFDataArray alloc] initWithItemSize:
 		    sizeof(struct kevent)];
 		_removedArray = [[OFMutableArray alloc] init];