diff --git a/substrate/core/rpc/src/chain/number.rs b/substrate/core/rpc/src/chain/number.rs
index 7983ac6c78..f927d51f14 100644
--- a/substrate/core/rpc/src/chain/number.rs
+++ b/substrate/core/rpc/src/chain/number.rs
@@ -17,7 +17,6 @@
 use serde::Deserialize;
 use std::{convert::TryFrom, fmt::Debug};
 use primitives::U256;
-use runtime_primitives::traits;
 
 /// RPC Block number type
 ///