diff --git a/targets/TARGET_NUVOTON/TARGET_M2351/rtc_api.c b/targets/TARGET_NUVOTON/TARGET_M2351/rtc_api.c
index 8a6b1502c7..32717e5951 100644
--- a/targets/TARGET_NUVOTON/TARGET_M2351/rtc_api.c
+++ b/targets/TARGET_NUVOTON/TARGET_M2351/rtc_api.c
@@ -34,7 +34,7 @@
  * We need RTC to be secure for security concern.
  *
  * On M2351, configured to secure
- * On M2351, hard-wired to secure
+ * On M2354, hard-wired to secure
  */
 #if defined(SCU_INIT_PNSSET2_VAL) && (SCU_INIT_PNSSET2_VAL & (1 << 1))
 #error("Limited by BSP/RTC, we can only support secure RTC.")