diff --git a/sync/src/tests/helpers.rs b/sync/src/tests/helpers.rs
index 63a0b88bb..b788e0c2a 100644
--- a/sync/src/tests/helpers.rs
+++ b/sync/src/tests/helpers.rs
@@ -117,7 +117,7 @@ impl BlockChainClient for TestBlockChainClient {
 		unimplemented!();
 	}
 
-	fn logs(&self, filter: Filter) -> Vec<LocalizedLogEntry> {
+	fn logs(&self, _filter: Filter) -> Vec<LocalizedLogEntry> {
 		unimplemented!();
 	}