diff --git a/client/db/src/lib.rs b/client/db/src/lib.rs
index 590b5dd89b05f..7346b17ebb2ad 100644
--- a/client/db/src/lib.rs
+++ b/client/db/src/lib.rs
@@ -1616,7 +1616,7 @@ impl<Block: BlockT> Backend<Block> {
 				let number = header.number();
 				let hash = header.hash();
 
-				self.set_head_with_transaction(&mut transaction, hash.clone(), (*number, hash))?;
+				self.set_head_with_transaction(&mut transaction, hash, (*number, hash))?;
 
 				meta_updates.push(MetaUpdate {
 					hash,
@@ -2244,7 +2244,7 @@ impl<Block: BlockT> sc_client_api::backend::Backend<Block> for Backend<Block> {
 		};
 		if is_genesis {
 			if let Some(genesis_state) = &*self.genesis_state.read() {
-				let root = genesis_state.root.clone();
+				let root = genesis_state.root;
 				let db_state = DbStateBuilder::<Block>::new(genesis_state.clone(), root)
 					.with_optional_cache(self.shared_trie_cache.as_ref().map(|c| c.local_cache()))
 					.build();
diff --git a/primitives/state-machine/src/lib.rs b/primitives/state-machine/src/lib.rs
index 98bcf19d440c3..59488599883e9 100644
--- a/primitives/state-machine/src/lib.rs
+++ b/primitives/state-machine/src/lib.rs
@@ -1938,7 +1938,7 @@ mod tests {
 
 			let trie: InMemoryBackend<BlakeTwo256> =
 				(storage.clone(), StateVersion::default()).into();
-			let trie_root = trie.root().clone();
+			let trie_root = *trie.root();
 			let backend = TrieBackendBuilder::wrap(&trie).with_recorder(Default::default()).build();
 			let mut queries = Vec::new();
 			for c in 0..(5 + nb_child_trie / 2) {
diff --git a/primitives/state-machine/src/trie_backend.rs b/primitives/state-machine/src/trie_backend.rs
index 4f3c0c75443fe..447c276a6049c 100644
--- a/primitives/state-machine/src/trie_backend.rs
+++ b/primitives/state-machine/src/trie_backend.rs
@@ -1055,11 +1055,11 @@ pub mod tests {
 			&b"doesnotexist2"[..],
 		];
 
-		fn check_estimation<'a>(
+		fn check_estimation(
 			backend: TrieBackend<
 				impl TrieBackendStorage<BlakeTwo256>,
 				BlakeTwo256,
-				&'a LocalTrieCache<BlakeTwo256>,
+				&'_ LocalTrieCache<BlakeTwo256>,
 			>,
 			has_cache: bool,
 		) {
diff --git a/primitives/trie/src/cache/mod.rs b/primitives/trie/src/cache/mod.rs
index 3bf3f7efba03e..a588f20bdb7b4 100644
--- a/primitives/trie/src/cache/mod.rs
+++ b/primitives/trie/src/cache/mod.rs
@@ -551,7 +551,7 @@ mod tests {
 
 			let storage_proof = recorder.drain_storage_proof();
 			let mut memory_db: MemoryDB = storage_proof.into_memory_db();
-			let mut proof_root = root.clone();
+			let mut proof_root = root;
 
 			{
 				let mut trie =
@@ -619,7 +619,7 @@ mod tests {
 			.node_cache()
 			.lru
 			.iter()
-			.map(|d| d.0.clone())
+			.map(|d| *d.0)
 			.collect::<Vec<_>>();
 
 		// Delete the value cache, so that we access the nodes.
@@ -644,7 +644,7 @@ mod tests {
 				.node_cache()
 				.lru
 				.iter()
-				.map(|d| d.0.clone())
+				.map(|d| *d.0)
 				.collect::<Vec<_>>()
 		);
 	}