diff --git a/src/thread.c b/src/thread.c
index f840fdd23118f2513d006cde42165e50958f4869..8dfe27523e6f4d284cc988266d9fef10ebe06529 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -781,7 +781,7 @@ rt_err_t rt_thread_control(rt_thread_t thread, int cmd, void *arg)
 
         case RT_THREAD_CTRL_CLOSE:
         {
-            rt_err_t rt_err;
+            rt_err_t rt_err = 0;
 
             if (rt_object_is_systemobject((rt_object_t)thread) == RT_TRUE)
             {