diff --git a/ethcore/src/client/test_client.rs b/ethcore/src/client/test_client.rs
index 44954f99d..cab703471 100644
--- a/ethcore/src/client/test_client.rs
+++ b/ethcore/src/client/test_client.rs
@@ -90,6 +90,8 @@ pub struct TestBlockChainClient {
pub ancient_block: RwLock