diff --git a/examples/kernel/tc_comm.c b/examples/kernel/tc_comm.c
index de9bb3ce31..008be9b746 100644
--- a/examples/kernel/tc_comm.c
+++ b/examples/kernel/tc_comm.c
@@ -49,6 +49,8 @@ void tc_thread_entry(void* parameter)
 						_tc_cleanup = RT_NULL;
 					}
 
+					rt_sem_trytake(&_tc_sem);/* by nl1031 */
+
 					if (_tc_stat & TC_STAT_FAILED)
 						rt_kprintf("TestCase[%s] failed\n", _tc_current);
 					else