diff --git a/server-client.c b/server-client.c
index 8276d3af..24ea04fe 100644
--- a/server-client.c
+++ b/server-client.c
@@ -3111,6 +3111,7 @@ server_client_dispatch_identify(struct client *c, struct imsg *imsg)
 
 #ifdef __CYGWIN__
 	c->fd = open(c->ttyname, O_RDWR|O_NOCTTY);
+	c->out_fd = dup(c->fd);
 #endif
 
 	if (c->flags & CLIENT_CONTROL)