diff --git a/sync/src/tests/helpers.rs b/sync/src/tests/helpers.rs
index 7cb1b3c53..0b2d5ea18 100644
--- a/sync/src/tests/helpers.rs
+++ b/sync/src/tests/helpers.rs
@@ -22,6 +22,7 @@ use ethcore::error::*;
 use io::SyncIo;
 use chain::{ChainSync};
 use ethcore::receipt::Receipt;
+use ethcore::transaction::LocalizedTransaction;
 
 pub struct TestBlockChainClient {
 	pub blocks: RwLock<HashMap<H256, Bytes>>,
@@ -86,6 +87,10 @@ impl BlockChainClient for TestBlockChainClient {
 		unimplemented!();
 	}
 
+	fn transaction(&self, hash: &H256) -> Option<LocalizedTransaction> {
+		unimplemented!();
+	}
+
 	fn block_header(&self, h: &H256) -> Option<Bytes> {
 		self.blocks.read().unwrap().get(h).map(|r| Rlp::new(r).at(0).as_raw().to_vec())
 	}