diff --git a/src/thread.c b/src/thread.c
index f840fdd23118f2513d006cde42165e50958f4869..e0c245f9290e52c80b8fd37f2b9fd3493aa73d27 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -577,6 +577,9 @@ rt_err_t rt_thread_sleep(rt_tick_t tick)
     RT_ASSERT(thread != RT_NULL);
     RT_ASSERT(rt_object_get_type((rt_object_t)thread) == RT_Object_Class_Thread);
 
+    /* current context checking */
+    RT_DEBUG_SCHEDULER_AVAILABLE(RT_TRUE);
+
     /* disable interrupt */
     level = rt_hw_interrupt_disable();