diff --git a/aes-kw/src/error.rs b/aes-kw/src/error.rs
index 0a3a0b6..6fb9539 100644
--- a/aes-kw/src/error.rs
+++ b/aes-kw/src/error.rs
@@ -1,7 +1,7 @@
 use core::fmt;
 
 /// Errors emitted from the wrap and unwrap operations.
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub enum Error {
     /// Input data length invalid.
     InvalidDataSize,