diff --git a/targets/TARGET_NUVOTON/TARGET_M2351/device/system_M2351.c b/targets/TARGET_NUVOTON/TARGET_M2351/device/system_M2351.c
index 5d70e34618..e7cc9daed5 100644
--- a/targets/TARGET_NUVOTON/TARGET_M2351/device/system_M2351.c
+++ b/targets/TARGET_NUVOTON/TARGET_M2351/device/system_M2351.c
@@ -24,7 +24,6 @@ extern void *__vector_table;                   /* see startup file */
 #else
 extern void *__vector_handlers;                   /* see startup file */
 #endif
-extern uint32_t GetPC(void);              /* Get current program counter(PC) */
 
 
 /*----------------------------------------------------------------------------