diff --git a/os/src/process/structs.rs b/os/src/process/structs.rs
index 236a747..61d7c2f 100644
--- a/os/src/process/structs.rs
+++ b/os/src/process/structs.rs
@@ -22,7 +22,6 @@ pub enum Status {
     Exited(ExitCode),
 }
 
-#[derive(Clone)]
 pub struct Thread {
     pub context: Context,
     pub kstack: KernelStack,