diff --git a/ethcore/src/spec/genesis.rs b/ethcore/src/spec/genesis.rs
index 41d9ceb33..937d7ed87 100644
--- a/ethcore/src/spec/genesis.rs
+++ b/ethcore/src/spec/genesis.rs
@@ -15,9 +15,9 @@
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
 use ethereum_types::{H256, U256, Address};
-use hash::KECCAK_NULL_RLP;
 use ethjson;
-use super::seal::Seal;
+use hash::KECCAK_NULL_RLP;
+use spec::seal::Seal;
 
 /// Genesis components.
 pub struct Genesis {
diff --git a/ethcore/src/spec/mod.rs b/ethcore/src/spec/mod.rs
index 2658858a5..087b3b8b5 100644
--- a/ethcore/src/spec/mod.rs
+++ b/ethcore/src/spec/mod.rs
@@ -18,7 +18,7 @@
 
 mod genesis;
 mod seal;
-pub mod spec;
+mod spec;
 
-pub use self::spec::*;
 pub use self::genesis::Genesis;
+pub use self::spec::{Spec, SpecParams, CommonParams, OptimizeFor};
diff --git a/ethcore/src/spec/seal.rs b/ethcore/src/spec/seal.rs
index 32a4d3b83..2a07e69c4 100644
--- a/ethcore/src/spec/seal.rs
+++ b/ethcore/src/spec/seal.rs
@@ -16,7 +16,7 @@
 
 //! Spec seal.
 
-use rlp::*;
+use rlp::RlpStream;
 use ethereum_types::{H64, H256, H520};
 use ethjson;
 
diff --git a/ethcore/src/spec/spec.rs b/ethcore/src/spec/spec.rs
index ba9e578db..cd3a1f2ac 100644
--- a/ethcore/src/spec/spec.rs
+++ b/ethcore/src/spec/spec.rs
@@ -16,24 +16,21 @@
 
 //! Parameters for a block chain.
 
-use std::io::Read;
 use std::collections::BTreeMap;
+use std::io::Read;
 use std::path::Path;
 use std::sync::Arc;
 
-use ethereum_types::{H256, Bloom, U256, Address};
-use memorydb::MemoryDB;
 use bytes::Bytes;
+use ethereum_types::{H256, Bloom, U256, Address};
 use ethjson;
 use hash::{KECCAK_NULL_RLP, keccak};
+use memorydb::MemoryDB;
 use parking_lot::RwLock;
 use rlp::{Rlp, RlpStream};
 use rustc_hex::FromHex;
 use vm::{EnvInfo, CallType, ActionValue, ActionParams, ParamsType};
 
-use super::genesis::Genesis;
-use super::seal::Generic as GenericSeal;
-
 use builtin::Builtin;
 use engines::{EthEngine, NullEngine, InstantSeal, BasicAuthority, AuthorityRound, Tendermint, DEFAULT_BLOCKHASH_CONTRACT};
 use error::Error;
@@ -41,9 +38,11 @@ use executive::Executive;
 use factory::Factories;
 use header::{BlockNumber, Header};
 use machine::EthereumMachine;
-use pod_state::*;
-use state::{Backend, State, Substate};
+use pod_state::PodState;
+use spec::Genesis;
+use spec::seal::Generic as GenericSeal;
 use state::backend::Basic as BasicBackend;
+use state::{Backend, State, Substate};
 use trace::{NoopTracer, NoopVMTracer};
 
 pub use ethash::OptimizeFor;
@@ -819,9 +818,8 @@ impl Spec {
 mod tests {
 	use super::*;
 	use state::State;
-	use std::str::FromStr;
 	use tests::helpers::get_temp_state_db;
-	use views::*;
+	use views::BlockView;
 
 	// https://github.com/paritytech/parity/issues/1840
 	#[test]
@@ -835,16 +833,12 @@ mod tests {
 
 		assert_eq!(
 			test_spec.state_root(),
-			H256::from_str(
-				"f3f4696bbf3b3b07775128eb7a3763279a394e382130f27c21e70233e04946a9",
-			).unwrap()
+			"f3f4696bbf3b3b07775128eb7a3763279a394e382130f27c21e70233e04946a9".into()
 		);
 		let genesis = test_spec.genesis_block();
 		assert_eq!(
 			BlockView::new(&genesis).header_view().hash(),
-			H256::from_str(
-				"0cd786a2425d16f152c658316c423e6ce1181e15c3295826d7c9904cba9ce303",
-			).unwrap()
+			"0cd786a2425d16f152c658316c423e6ce1181e15c3295826d7c9904cba9ce303".into()
 		);
 	}
 
@@ -860,10 +854,8 @@ mod tests {
 			spec.engine.account_start_nonce(0),
 			Default::default(),
 		).unwrap();
-		let expected = H256::from_str(
-			"0000000000000000000000000000000000000000000000000000000000000001",
-		).unwrap();
-		let address = Address::from_str("0000000000000000000000000000000000001337").unwrap();
+		let expected = "0000000000000000000000000000000000000000000000000000000000000001".into();
+		let address = "0000000000000000000000000000000000001337".into();
 
 		assert_eq!(state.storage_at(&address, &H256::zero()).unwrap(), expected);
 		assert_eq!(state.balance(&address).unwrap(), 1.into());