diff --git a/targets/TARGET_TOSHIBA/TARGET_TMPM4G9/rtc_api.c b/targets/TARGET_TOSHIBA/TARGET_TMPM4G9/rtc_api.c
index 0028893659..f2ec4be487 100644
--- a/targets/TARGET_TOSHIBA/TARGET_TMPM4G9/rtc_api.c
+++ b/targets/TARGET_TOSHIBA/TARGET_TMPM4G9/rtc_api.c
@@ -1,5 +1,6 @@
 /* mbed Microcontroller Library
  * (C)Copyright TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION 2019 All rights reserved
+ * SPDX-License-Identifier: Apache-2.0
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.