diff --git a/pty_darwin.go b/pty_darwin.go
index 6344b6b..0ed4325 100644
--- a/pty_darwin.go
+++ b/pty_darwin.go
@@ -33,7 +33,7 @@ func open() (pty, tty *os.File, err error) {
 		return nil, nil, err
 	}
 
-	t, err := os.OpenFile(sname, os.O_RDWR, 0)
+	t, err := os.OpenFile(sname, os.O_RDWR|syscall.O_NOCTTY, 0)
 	if err != nil {
 		return nil, nil, err
 	}