diff --git a/serial_posix.go b/serial_posix.go
index 198d6bc..b429223 100644
--- a/serial_posix.go
+++ b/serial_posix.go
@@ -47,6 +47,10 @@ func openPort(name string, baud int) (rwc io.ReadWriteCloser, err error) {
 		speed = C.B19200
 	case 9600:
 		speed = C.B9600
+	case 4800:
+		speed = C.B4800
+	case 2400:
+		speed = C.B2400
 	default:
 		f.Close()
 		return nil, fmt.Errorf("Unknown baud rate %v", baud)