diff --git a/ethcore/light/src/net/tests/mod.rs b/ethcore/light/src/net/tests/mod.rs
index e2a17a41e..227eb9b7c 100644
--- a/ethcore/light/src/net/tests/mod.rs
+++ b/ethcore/light/src/net/tests/mod.rs
@@ -69,7 +69,7 @@ impl IoContext for Expect {
 		Some(super::MAX_PROTOCOL_VERSION)
 	}
 
-	fn persistent_peer_id(&self, _peer: PeerId) -> Option<NodeId> {
+	fn persistent_peer_id(&self, _peer: &PeerId) -> Option<NodeId> {
 		None
 	}
 }
diff --git a/ethcore/src/client/chain_notify.rs b/ethcore/src/client/chain_notify.rs
index ddab542fb..eb695e063 100644
--- a/ethcore/src/client/chain_notify.rs
+++ b/ethcore/src/client/chain_notify.rs
@@ -15,7 +15,7 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use ipc::IpcConfig;
-use util::{H256, H512};
+use util::H256;
 
 /// Represents what has to be handled by actor listening to chain events
 #[ipc]
diff --git a/ethcore/src/client/client.rs b/ethcore/src/client/client.rs
index c258ed1eb..70f198987 100644
--- a/ethcore/src/client/client.rs
+++ b/ethcore/src/client/client.rs
@@ -25,7 +25,7 @@ use time::precise_time_ns;
 use util::{Bytes, PerfTimer, Itertools, Mutex, RwLock, Hashable};
 use util::{journaldb, TrieFactory, Trie};
 use util::trie::TrieSpec;
-use util::{U256, H256, H512, Address, H2048, Uint, FixedHash};
+use util::{U256, H256, Address, H2048, Uint, FixedHash};
 use util::kvdb::*;
 
 // other