diff --git a/include/rtthread.h b/include/rtthread.h
index e66e30fddb..955ea51c50 100644
--- a/include/rtthread.h
+++ b/include/rtthread.h
@@ -75,7 +75,7 @@ void rt_system_tick_init(void);
 rt_tick_t rt_tick_get(void);
 void rt_tick_set(rt_tick_t tick);
 void rt_tick_increase(void);
-int  rt_tick_from_millisecond(rt_int32_t ms);
+rt_tick_t  rt_tick_from_millisecond(rt_int32_t ms);
 
 void rt_system_timer_init(void);
 void rt_system_timer_thread_init(void);