diff --git a/src/note.rs b/src/note.rs
index 82c109c..e9bcd14 100644
--- a/src/note.rs
+++ b/src/note.rs
@@ -1,7 +1,7 @@
 use crate::bindings;
 use crate::transaction::Transaction;
 
-#[derive(Debug, Clone, Eq, Ord, PartialEq, PartialOrd)]
+#[derive(Debug, Clone, Copy, Eq, Ord, PartialEq, PartialOrd)]
 pub struct NoteKey(u64);
 
 impl NoteKey {