@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
+ * Copyright (c) 2008-2022 Jonathan Schleifer <js@nil.im>
  *
  * All rights reserved.
  *
  * This file is part of ObjFW. It may be distributed under the terms of the
  * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
@@ -133,11 +133,11 @@
 		@throw [OFSetOptionFailedException exceptionWithObject: self
 								 errNo: errno];
 
 	_canBlock = canBlock;
 #elif defined(OF_WINDOWS)
-	u_long v = canBlock;
+	u_long v = !canBlock;
 
 	if (ioctlsocket(_socket, FIONBIO, &v) == SOCKET_ERROR)
 		@throw [OFSetOptionFailedException
 		    exceptionWithObject: self
 				  errNo: OFSocketErrNo()];
@@ -329,27 +329,27 @@
 	client->_remoteAddress.length =
 	    (socklen_t)sizeof(client->_remoteAddress.sockaddr);
 
 #if defined(HAVE_PACCEPT) && defined(SOCK_CLOEXEC)
 	if ((client->_socket = paccept(_socket,
-	    &client->_remoteAddress.sockaddr.sockaddr,
+	    (struct sockaddr *)&client->_remoteAddress.sockaddr,
 	    &client->_remoteAddress.length, NULL, SOCK_CLOEXEC)) ==
 	    OFInvalidSocketHandle)
 		@throw [OFAcceptFailedException
 		    exceptionWithSocket: self
 				  errNo: OFSocketErrNo()];
 #elif defined(HAVE_ACCEPT4) && defined(SOCK_CLOEXEC)
 	if ((client->_socket = accept4(_socket,
-	    &client->_remoteAddress.sockaddr.sockaddr,
+	    (struct sockaddr *)&client->_remoteAddress.sockaddr,
 	    &client->_remoteAddress.length, SOCK_CLOEXEC)) ==
 	    OFInvalidSocketHandle)
 		@throw [OFAcceptFailedException
 		    exceptionWithSocket: self
 				  errNo: OFSocketErrNo()];
 #else
 	if ((client->_socket = accept(_socket,
-	    &client->_remoteAddress.sockaddr.sockaddr,
+	    (struct sockaddr *)&client->_remoteAddress.sockaddr,
 	    &client->_remoteAddress.length)) == OFInvalidSocketHandle)
 		@throw [OFAcceptFailedException
 		    exceptionWithSocket: self
 				  errNo: OFSocketErrNo()];
 
@@ -360,11 +360,12 @@
 #endif
 
 	assert(client->_remoteAddress.length <=
 	    (socklen_t)sizeof(client->_remoteAddress.sockaddr));
 
-	switch (client->_remoteAddress.sockaddr.sockaddr.sa_family) {
+	switch (((struct sockaddr *)&client->_remoteAddress.sockaddr)
+	    ->sa_family) {
 	case AF_INET:
 		client->_remoteAddress.family = OFSocketAddressFamilyIPv4;
 		break;
 #ifdef OF_HAVE_IPV6
 	case AF_INET6: