diff --git a/unix/uxnet.c b/unix/uxnet.c
index 77a381f9..0dbb0ca5 100644
--- a/unix/uxnet.c
+++ b/unix/uxnet.c
@@ -1015,6 +1015,8 @@ static void sk_net_close(Socket *sock)
     if (s->child)
         sk_net_close(&s->child->sock);
 
+    bufchain_clear(&s->output_data);
+
     del234(sktree, s);
     if (s->s >= 0) {
         uxsel_del(s->s);
diff --git a/windows/winnet.c b/windows/winnet.c
index 0d42c989..b65e8d33 100644
--- a/windows/winnet.c
+++ b/windows/winnet.c
@@ -1337,6 +1337,8 @@ static void sk_net_close(Socket *sock)
     if (s->child)
 	sk_net_close(&s->child->sock);
 
+    bufchain_clear(&s->output_data);
+
     del234(sktree, s);
     do_select(s->s, false);
     p_closesocket(s->s);