diff --git a/include/rtthread.h b/include/rtthread.h
index 9cc0c4d879..c2174cce42 100644
--- a/include/rtthread.h
+++ b/include/rtthread.h
@@ -160,8 +160,8 @@ rt_thread_t rt_thread_create(const char *name,
                              rt_uint8_t  priority,
                              rt_uint32_t tick);
 rt_err_t rt_thread_delete(rt_thread_t thread);
-rt_err_t rt_thread_close(rt_thread_t thread);
 #endif /* RT_USING_HEAP */
+rt_err_t rt_thread_close(rt_thread_t thread);
 rt_thread_t rt_thread_self(void);
 rt_thread_t rt_thread_find(char *name);
 rt_err_t rt_thread_startup(rt_thread_t thread);