diff --git a/ethcore/src/client/client.rs.in b/ethcore/src/client/client.rs.in
index ddd401835..0c77574a9 100644
--- a/ethcore/src/client/client.rs.in
+++ b/ethcore/src/client/client.rs.in
@@ -48,6 +48,7 @@ pub use types::blockchain_info::BlockChainInfo;
 pub use types::block_status::BlockStatus;
 use evm::Factory as EvmFactory;
 use miner::{Miner, MinerService, TransactionImportResult, AccountDetails};
+use basic_types::*;
 
 use ipc::IpcConfig;
 use ipc::binary::{BinaryConvertable, BinaryConvertError};
@@ -576,9 +577,9 @@ impl BlockChainClient for Client {
 		self.transaction_address(id).and_then(|address| self.chain.transaction(&address))
 	}
 
-	fn uncle(&self, id: UncleID) -> Option<Header> {
+	fn uncle(&self, id: UncleID) -> Option<Bytes> {
 		let index = id.position;
-		self.block(id.block).and_then(|block| BlockView::new(&block).uncle_at(index))
+		self.block(id.block).and_then(|block| BlockView::new(&block).uncle_at(index).and_then(|u| Some(u.rlp(Seal::With))))
 	}
 
 	fn transaction_receipt(&self, id: TransactionID) -> Option<LocalizedReceipt> {
diff --git a/ethcore/src/client/mod.rs b/ethcore/src/client/mod.rs
index bef814b4e..e4e454d03 100644
--- a/ethcore/src/client/mod.rs
+++ b/ethcore/src/client/mod.rs
@@ -126,7 +126,7 @@ pub trait BlockChainClient : Sync + Send {
 	fn transaction(&self, id: TransactionID) -> Option<LocalizedTransaction>;
 
 	/// Get uncle with given id.
-	fn uncle(&self, id: UncleID) -> Option<Header>;
+	fn uncle(&self, id: UncleID) -> Option<Bytes>;
 
 	/// Get transaction receipt with given hash.
 	fn transaction_receipt(&self, id: TransactionID) -> Option<LocalizedReceipt>;
diff --git a/ethcore/src/client/test_client.rs b/ethcore/src/client/test_client.rs
index 69dff6c92..b54c7f867 100644
--- a/ethcore/src/client/test_client.rs
+++ b/ethcore/src/client/test_client.rs
@@ -294,7 +294,7 @@ impl BlockChainClient for TestBlockChainClient {
 		unimplemented!();
 	}
 
-	fn uncle(&self, _id: UncleID) -> Option<BlockHeader> {
+	fn uncle(&self, _id: UncleID) -> Option<Bytes> {
 		unimplemented!();
 	}