diff --git a/thirdparty/libwebsockets/plat/lws-plat-unix.c b/thirdparty/libwebsockets/plat/lws-plat-unix.c
index 7dba3bd82..d1bca8b5d 100644
--- a/thirdparty/libwebsockets/plat/lws-plat-unix.c
+++ b/thirdparty/libwebsockets/plat/lws-plat-unix.c
@@ -328,6 +328,11 @@ lws_plat_set_socket_options(struct lws_vhost *vhost, int fd)
 	int optval = 1;
 	socklen_t optlen = sizeof(optval);
 
+#ifdef LWS_WITH_IPV6
+	optval = 0;
+	setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (const void*)&optval, optlen);
+#endif
+
 #if defined(__APPLE__) || \
     defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
     defined(__NetBSD__) || \
diff --git a/thirdparty/libwebsockets/plat/lws-plat-win.c b/thirdparty/libwebsockets/plat/lws-plat-win.c
index 1850b6425..26caab2cd 100644
--- a/thirdparty/libwebsockets/plat/lws-plat-win.c
+++ b/thirdparty/libwebsockets/plat/lws-plat-win.c
@@ -348,6 +348,11 @@ lws_plat_set_socket_options(struct lws_vhost *vhost, lws_sockfd_type fd)
 	struct protoent *tcp_proto;
 #endif
 
+#ifdef LWS_WITH_IPV6
+	optval = 0;
+	setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (const void*)&optval, optlen);
+#endif
+
 	if (vhost->ka_time) {
 		/* enable keepalive on this socket */
 		optval = 1;