diff --git a/ethcore/src/client.rs b/ethcore/src/client.rs
index c40ac2ab8..858185873 100644
--- a/ethcore/src/client.rs
+++ b/ethcore/src/client.rs
@@ -233,7 +233,7 @@ impl Client<CanonVerifier> {
 
 impl<V> Client<V> where V: Verifier {
 	///  Create a new client with given spec and DB path and custom verifier.
-	pub fn new_with_verifier(config: ClientConfig, spec: Spec, path: &Path, message_channel: IoChannel<NetSyncMessage> ) -> Result<Arc<Client>, Error> {
+	pub fn new_with_verifier(config: ClientConfig, spec: Spec, path: &Path, message_channel: IoChannel<NetSyncMessage> ) -> Result<Arc<Client<V>>, Error> {
 		let mut dir = path.to_path_buf();
 		dir.push(H64::from(spec.genesis_header().hash()).hex());
 		//TODO: sec/fat: pruned/full versioning
@@ -312,7 +312,7 @@ impl<V> Client<V> where V: Verifier {
 		}
 
 		// Verify Block Family
-		let verify_family_result = verify_block_family(&header, &block.bytes, engine, self.chain.read().unwrap().deref());
+		let verify_family_result = V::verify_block_family(&header, &block.bytes, engine, self.chain.read().unwrap().deref());
 		if let Err(e) = verify_family_result {
 			warn!(target: "client", "Stage 3 block verification failed for #{} ({})\nError: {:?}", header.number(), header.hash(), e);
 			return Err(());
diff --git a/ethcore/src/verification/canon_verifier.rs b/ethcore/src/verification/canon_verifier.rs
index 0d9cbc6b6..30e368f1b 100644
--- a/ethcore/src/verification/canon_verifier.rs
+++ b/ethcore/src/verification/canon_verifier.rs
@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+use blockchain::BlockProvider;
+use engine::Engine;
 use error::Error;
 use header::Header;
 use super::Verifier;
@@ -22,6 +24,10 @@ use super::verification;
 pub struct CanonVerifier;
 
 impl Verifier for CanonVerifier {
+	fn verify_block_family(header: &Header, bytes: &[u8], engine: &Engine, bc: &BlockProvider) -> Result<(), Error> {
+		verification::verify_block_family(header, bytes, engine, bc)
+	}
+
 	fn verify_block_final(expected: &Header, got: &Header) -> Result<(), Error> {
 		verification::verify_block_final(expected, got)
 	}
diff --git a/ethcore/src/verification/noop_verifier.rs b/ethcore/src/verification/noop_verifier.rs
index 8dfd64771..ae2a153fe 100644
--- a/ethcore/src/verification/noop_verifier.rs
+++ b/ethcore/src/verification/noop_verifier.rs
@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+use blockchain::BlockProvider;
+use engine::Engine;
 use error::Error;
 use header::Header;
 use super::Verifier;
@@ -21,6 +23,10 @@ use super::Verifier;
 pub struct NoopVerifier;
 
 impl Verifier for NoopVerifier {
+	fn verify_block_family(_header: &Header, _bytes: &[u8], _engine: &Engine, _bc: &BlockProvider) -> Result<(), Error> {
+		Ok(())
+	}
+
 	fn verify_block_final(_expected: &Header, _got: &Header) -> Result<(), Error> {
 		Ok(())
 	}
diff --git a/ethcore/src/verification/verification.rs b/ethcore/src/verification/verification.rs
index 761e2e8cd..ed3db3791 100644
--- a/ethcore/src/verification/verification.rs
+++ b/ethcore/src/verification/verification.rs
@@ -78,7 +78,7 @@ pub fn verify_block_unordered(header: Header, bytes: Bytes, engine: &Engine) ->
 }
 
 /// Phase 3 verification. Check block information against parent and uncles.
-pub fn verify_block_family<BC>(header: &Header, bytes: &[u8], engine: &Engine, bc: &BC) -> Result<(), Error> where BC: BlockProvider {
+pub fn verify_block_family(header: &Header, bytes: &[u8], engine: &Engine, bc: &BlockProvider) -> Result<(), Error> {
 	// TODO: verify timestamp
 	let parent = try!(bc.block_header(&header.parent_hash).ok_or_else(|| Error::from(BlockError::UnknownParent(header.parent_hash.clone()))));
 	try!(verify_parent(&header, &parent));
diff --git a/ethcore/src/verification/verifier.rs b/ethcore/src/verification/verifier.rs
index 0ffbf3bdd..cc5edce29 100644
--- a/ethcore/src/verification/verifier.rs
+++ b/ethcore/src/verification/verifier.rs
@@ -14,10 +14,13 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+use blockchain::BlockProvider;
+use engine::Engine;
 use error::Error;
 use header::Header;
 
 /// Should be used to verify blocks.
 pub trait Verifier: Send + Sync {
+	fn verify_block_family(header: &Header, bytes: &[u8], engine: &Engine, bc: &BlockProvider) -> Result<(), Error>;
 	fn verify_block_final(expected: &Header, got: &Header) -> Result<(), Error>;
 }