diff --git a/os/src/task/mod.rs b/os/src/task/mod.rs
index 00a056d..e4837cb 100644
--- a/os/src/task/mod.rs
+++ b/os/src/task/mod.rs
@@ -24,6 +24,7 @@ mod switch;
 mod task;
 
 use crate::fs::{open_file, OpenFlags};
+use crate::sbi::shutdown;
 use alloc::sync::Arc;
 pub use context::TaskContext;
 use lazy_static::*;