diff --git a/rpc/src/v1/impls/eth.rs b/rpc/src/v1/impls/eth.rs
index 98b28d70f..141593451 100644
--- a/rpc/src/v1/impls/eth.rs
+++ b/rpc/src/v1/impls/eth.rs
@@ -428,8 +428,8 @@ impl<C, S, A, M, EM> Eth for EthClient<C, S, A, M, EM>
 				miner.map_sealing_work(client.deref(), |b| {
 					let pow_hash = b.hash();
 					let target = Ethash::difficulty_to_boundary(b.block().header().difficulty());
-					let seed_hash = self.seed_compute.lock().unwrap().get_seedhash(b.block().header().number());
-					to_value(&(pow_hash, seed_hash, target))
+					let seed_hash = &self.seed_compute.lock().unwrap().get_seedhash(b.block().header().number());
+					to_value(&(pow_hash, H256::from_slice(&seed_hash[..]), target))
 				}).unwrap_or(Err(Error::internal_error()))	// no work found.
 			},
 			_ => Err(Error::invalid_params())