diff --git a/primitives/src/witness.rs b/primitives/src/witness.rs
index 96d1b4747..78bb13d8d 100644
--- a/primitives/src/witness.rs
+++ b/primitives/src/witness.rs
@@ -361,6 +361,7 @@ impl fmt::Debug for Witness {
 }
 
 /// An iterator returning individual witness elements.
+#[derive(Clone)]
 pub struct Iter<'a> {
     inner: &'a [u8],
     indices_start: usize,