diff --git a/slirp/tcp_subr.c b/slirp/tcp_subr.c
index a1f060b..feae861 100644
--- a/slirp/tcp_subr.c
+++ b/slirp/tcp_subr.c
@@ -439,6 +439,7 @@ void tcp_connect(struct socket *inso)
             return;
         }
         so->lhost = inso->lhost;
+        so->ffamily = inso->so_ffamily;
     }
 
     tcp_mss(sototcpcb(so), 0);