diff --git a/rt-thread-version/rt-thread-nano/nano-port-keil/an0039-nano-port-keil.md b/rt-thread-version/rt-thread-nano/nano-port-keil/an0039-nano-port-keil.md
index 9667f33668b6d49162a35b58b7093fed988c71e8..90c5feb5edcce431410f6c3428e2731c0dfc3878 100644
--- a/rt-thread-version/rt-thread-nano/nano-port-keil/an0039-nano-port-keil.md
+++ b/rt-thread-version/rt-thread-nano/nano-port-keil/an0039-nano-port-keil.md
@@ -119,7 +119,7 @@ void rt_os_tick_callback(void)
 }
 
 /* cortex-m 架构使用 SysTick_Handler() */
-SysTick_Handler()
+void SysTick_Handler()
 {
     rt_os_tick_callback();
 }
@@ -138,7 +138,7 @@ void rt_hw_board_init(void)
   SystemCoreClockUpdate(); // 对系统时钟进行更新
 
   /* 2、OS Tick 频率配置，RT_TICK_PER_SECOND = 1000 表示 1ms 触发一次中断 */
-  _SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
+  SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
 
   /* Call components board initial (use INIT_BOARD_EXPORT()) */
 #ifdef RT_USING_COMPONENTS_INIT