diff --git a/demo/os/rt-thread/stm32f10x/app/src/app_task.c b/demo/os/rt-thread/stm32f10x/app/src/app_task.c
index ddf7d44..33e54e0 100644
--- a/demo/os/rt-thread/stm32f10x/app/src/app_task.c
+++ b/demo/os/rt-thread/stm32f10x/app/src/app_task.c
@@ -172,7 +172,7 @@ static rt_err_t exception_hook(void *context) {
 
     /* write all buffered log to flash */
     elog_flash_flush();
-	while(1);
+    while(1);
 
     return RT_EOK;
 }