diff --git a/lib/net.l b/lib/net.l
index c4ac1f4..863410f 100644
--- a/lib/net.l
+++ b/lib/net.l
@@ -16,12 +16,6 @@
       (when (lt0 Sd)
          (ipErr "IP socket") )
       (%@ "closeOnExec" NIL (cons T (up)) Sd)
-      (when
-         (lt0
-            (%@ "setsockopt" 'I Sd IPPROTO_IPV6 IPV6_V6ONLY  #? OpenBSD
-               '(NIL (4 . I) (0 . 4))
-               4 ) )
-         (ipErr "IPV6_V6ONLY") )
       (buf Addr sockaddr_in6
          (%@ "memset" NIL Addr 0 sockaddr_in6)
          (struct (+ Addr sin6_family) NIL (`AF_INET6 . 2))