diff --git a/aarch64/src/lib.rs b/aarch64/src/lib.rs
index 2a0200e1c4..65c849d600 100644
--- a/aarch64/src/lib.rs
+++ b/aarch64/src/lib.rs
@@ -3,8 +3,7 @@
 // found in the LICENSE file.
 
 use std::collections::BTreeMap;
-use std::error::Error as StdError;
-use std::io::{self};
+use std::io;
 use std::mem::size_of;
 use std::sync::Arc;