diff --git a/contrib/unbound/util/config_file.c b/contrib/unbound/util/config_file.c
--- a/contrib/unbound/util/config_file.c
+++ b/contrib/unbound/util/config_file.c
@@ -210,7 +210,13 @@
 	cfg->if_automatic = 0;
 	cfg->if_automatic_ports = NULL;
 	cfg->so_rcvbuf = 0;
+#ifdef __FreeBSD_cc_version
+	/* FreeBSD specific default */
+	cfg->so_sndbuf = 0;
+#else
+	/* Upstream default */
 	cfg->so_sndbuf = 4*1024*1024;
+#endif
 	cfg->so_reuseport = REUSEPORT_DEFAULT;
 	cfg->ip_transparent = 0;
 	cfg->ip_freebind = 0;