diff --git a/src/mine_loop.rs b/src/mine_loop.rs
index e862d43a..3f69d757 100644
--- a/src/mine_loop.rs
+++ b/src/mine_loop.rs
@@ -1579,7 +1579,7 @@ pub(crate) mod mine_loop_tests {
 
             guess_worker(
                 block,
-                prev_block.header().clone(),
+                *prev_block.header(),
                 worker_task_tx,
                 composer_utxos,
                 sleepy_guessing,
@@ -1776,7 +1776,7 @@ pub(crate) mod mine_loop_tests {
         let mut rng = thread_rng();
         let mut counter = 0;
         let mut successor_block = Block::new(
-            successor_header.clone(),
+            successor_header,
             successor_body.clone(),
             appendix,
             BlockProof::Invalid,
diff --git a/src/models/blockchain/block/validity/block_primitive_witness.rs b/src/models/blockchain/block/validity/block_primitive_witness.rs
index 1d7292dd..35808681 100644
--- a/src/models/blockchain/block/validity/block_primitive_witness.rs
+++ b/src/models/blockchain/block/validity/block_primitive_witness.rs
@@ -297,7 +297,7 @@ pub(crate) mod test {
                                 (parent_header, parent_body, parent_appendix).prop_flat_map(
                                     move |(header, body, appendix)| {
                                         let parent_kernel = BlockKernel {
-                                            header: header.clone(),
+                                            header,
                                             body: body.clone(),
                                             appendix: appendix.clone(),
                                         };