diff --git a/src/clock.c b/src/clock.c
index d56f4b00f3..e288ff58a9 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -89,7 +89,7 @@ void rt_tick_increase(void)
         /* change to initialized tick */
         thread->remaining_tick = thread->init_tick;
 
-        thread->can_yield = 1;
+        thread->can_yield = RT_TRUE;
 
         /* yield */
         rt_thread_yield();
diff --git a/src/scheduler.c b/src/scheduler.c
index 3adf430d70..c58ecf6209 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -344,13 +344,13 @@ void rt_schedule(void)
                 {
                     to_thread = current_thread;
                 }
-                else if (current_thread->current_priority == highest_ready_priority && current_thread->can_yield == 0)
+                else if (current_thread->current_priority == highest_ready_priority && current_thread->can_yield == RT_FALSE)
                 {
                     to_thread = current_thread;
                 }
                 else
                 {
-                    current_thread->can_yield = 0;
+                    current_thread->can_yield = RT_FALSE;
                     rt_schedule_insert_thread(current_thread);
                 }
             }
@@ -440,13 +440,13 @@ void rt_schedule(void)
                 {
                     to_thread = rt_current_thread;
                 }
-                else if (rt_current_thread->current_priority == highest_ready_priority && rt_current_thread->can_yield == 0)
+                else if (rt_current_thread->current_priority == highest_ready_priority && rt_current_thread->can_yield == RT_FALSE)
                 {
                     to_thread = rt_current_thread;
                 }
                 else
                 {
-                    rt_current_thread->can_yield = 0;
+                    rt_current_thread->can_yield = RT_FALSE;
                     need_insert_from_thread = 1;
                 }
             }
@@ -588,13 +588,13 @@ void rt_scheduler_do_irq_switch(void *context)
                 {
                     to_thread = current_thread;
                 }
-                else if (current_thread->current_priority == highest_ready_priority && current_thread->can_yield == 0)
+                else if (current_thread->current_priority == highest_ready_priority && current_thread->can_yield == RT_FALSE)
                 {
                     to_thread = current_thread;
                 }
                 else
                 {
-                    current_thread->can_yield = 0;
+                    current_thread->can_yield = RT_FALSE;
                     rt_schedule_insert_thread(current_thread);
                 }
             }
diff --git a/src/thread.c b/src/thread.c
index cf42c72a1b..6f6fa1029a 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -159,7 +159,7 @@ static rt_err_t _rt_thread_init(struct rt_thread *thread,
     /* tick init */
     thread->init_tick      = tick;
     thread->remaining_tick = tick;
-    thread->can_yield      = 0;
+    thread->can_yield      = RT_FALSE;
 
     /* error and flags */
     thread->error = RT_EOK;