diff --git a/sync/src/range_collection.rs b/sync/src/range_collection.rs
index c3333ab63..dc2f4e446 100644
--- a/sync/src/range_collection.rs
+++ b/sync/src/range_collection.rs
@@ -207,7 +207,7 @@ impl<K, V> RangeCollection<K, V> for Vec<(K, Vec<V>)> where K: Ord + PartialEq +
 }
 
 #[test]
-#[allow(cyclomatic_complexity)]
+#[cfg_attr(feature="dev", allow(cyclomatic_complexity))]
 fn test_range() {
 	use std::cmp::{Ordering};
 
diff --git a/sync/src/tests/helpers.rs b/sync/src/tests/helpers.rs
index ca6d79814..7f2928ccd 100644
--- a/sync/src/tests/helpers.rs
+++ b/sync/src/tests/helpers.rs
@@ -23,6 +23,8 @@ use io::SyncIo;
 use chain::{ChainSync};
 use ethcore::receipt::Receipt;
 use ethcore::transaction::LocalizedTransaction;
+use ethcore::filter::Filter;
+use ethcore::log_entry::LocalizedLogEntry;
 
 pub struct TestBlockChainClient {
 	pub blocks: RwLock<HashMap<H256, Bytes>>,
@@ -115,6 +117,10 @@ impl BlockChainClient for TestBlockChainClient {
 		unimplemented!();
 	}
 
+	fn logs(&self, filter: Filter) -> Vec<LocalizedLogEntry> {
+		unimplemented!();
+	}
+
 	fn block_header(&self, id: BlockId) -> Option<Bytes> {
 		self.block_hash(id).and_then(|hash| self.blocks.read().unwrap().get(&hash).map(|r| Rlp::new(r).at(0).as_raw().to_vec()))
 	}