diff --git a/ethcore/src/types/transaction.rs b/ethcore/src/types/transaction.rs
index 2cc25a745..1c6ef92e3 100644
--- a/ethcore/src/types/transaction.rs
+++ b/ethcore/src/types/transaction.rs
@@ -305,7 +305,7 @@ impl SignedTransaction {
 	pub fn standard_v(&self) -> u8 { match self.v { v if v == 27 || v == 28 || v > 36 => ((v - 1) % 2) as u8, _ => 4 } }
 
 	/// The `v` value that appears in the RLP.
-	pub fn original_v(&self) -> u8 { self.v }
+	pub fn original_v(&self) -> u64 { self.v }
 
 	/// The network ID, or `None` if this is a global transaction.
 	pub fn network_id(&self) -> Option<u64> {
diff --git a/rpc/src/v1/types/transaction.rs b/rpc/src/v1/types/transaction.rs
index 7f26adf41..933a4a482 100644
--- a/rpc/src/v1/types/transaction.rs
+++ b/rpc/src/v1/types/transaction.rs
@@ -59,7 +59,7 @@ pub struct Transaction {
 	pub public_key: Option<H512>,
 	/// The network id of the transaction, if any.
 	#[serde(rename="networkId")]
-	pub network_id: Option<u8>,
+	pub network_id: Option<u64>,
 	/// The standardised V field of the signature (0 or 1).
 	#[serde(rename="standardV")]
 	pub standard_v: U256,