diff --git a/os/src/loader.rs b/os/src/loader.rs
index 47e1bcf4..ac017e83 100644
--- a/os/src/loader.rs
+++ b/os/src/loader.rs
@@ -1,5 +1,4 @@
 use crate::trap::TrapContext;
-use crate::task::TaskContext;
 use crate::config::*;
 
 #[repr(align(4096))]