diff --git a/utilities/at32f421_freertos_demo/inc/TaskLoop.h b/utilities/at32f421_freertos_demo/inc/TaskLoop.h
index 639b68c..e0a55b6 100644
--- a/utilities/at32f421_freertos_demo/inc/TaskLoop.h
+++ b/utilities/at32f421_freertos_demo/inc/TaskLoop.h
@@ -180,7 +180,7 @@ void poll_sw_state(void);
 uint32_t get_flt_value(uint32_t new_value, uint32_t last_Value);
 uint8_t update_moving_average(uint32_t* p_sum, uint16_t* p_cnt,
                               uint32_t* p_origin, uint32_t new_value,
-                              uint8_t window);
+                              uint16_t window);
 void poll_yellow_led(void);
 void poll_green_led(void);
 void LEDA_ON_OFF(void);
diff --git a/utilities/at32f421_freertos_demo/src/TaskLoop.c b/utilities/at32f421_freertos_demo/src/TaskLoop.c
index ed82c2b..eb05e51 100644
--- a/utilities/at32f421_freertos_demo/src/TaskLoop.c
+++ b/utilities/at32f421_freertos_demo/src/TaskLoop.c
@@ -175,7 +175,7 @@ uint32_t get_flt_value(uint32_t new_value, uint32_t last_Value)
  *===========================================================================*/
 uint8_t update_moving_average(uint32_t* p_sum, uint16_t* p_cnt,
                               uint32_t* p_origin, uint32_t new_value,
-                              uint8_t window)
+                              uint16_t window)
 {
     if (!p_sum || !p_cnt || !p_origin || window == 0) {
         return 0;