diff --git a/targets/TARGET_NUVOTON/TARGET_M2351/TARGET_NUMAKER_PFM_M2351/mbed_overrides.c b/targets/TARGET_NUVOTON/TARGET_M2351/TARGET_NUMAKER_PFM_M2351/mbed_overrides.c
index 5e9d49122c..9ccfbe535d 100644
--- a/targets/TARGET_NUVOTON/TARGET_M2351/TARGET_NUMAKER_PFM_M2351/mbed_overrides.c
+++ b/targets/TARGET_NUVOTON/TARGET_M2351/TARGET_NUMAKER_PFM_M2351/mbed_overrides.c
@@ -73,5 +73,7 @@ void mbed_sdk_init(void)
 
     /* Lock protected registers */
     SYS_LockReg();
+#else
+    SystemCoreClockUpdate();
 #endif		
 }