diff --git a/src/blockdata/block.rs b/src/blockdata/block.rs
index 5a415594..989201db 100644
--- a/src/blockdata/block.rs
+++ b/src/blockdata/block.rs
@@ -37,7 +37,7 @@ use VarInt;
 #[derive(Copy, PartialEq, Eq, Clone, Debug)]
 pub struct BlockHeader {
     /// The protocol version. Should always be 1.
-    pub version: u32,
+    pub version: i32,
     /// Reference to the previous block in the chain
     pub prev_blockhash: BlockHash,
     /// The root hash of the merkle tree of transactions in the block
@@ -320,4 +320,3 @@ mod tests {
         assert_eq!(header.bits, BlockHeader::compact_target_from_u256(&header.target()));
     }
 }
-
diff --git a/src/blockdata/transaction.rs b/src/blockdata/transaction.rs
index 6b091f82..bc9cd2fb 100644
--- a/src/blockdata/transaction.rs
+++ b/src/blockdata/transaction.rs
@@ -260,7 +260,7 @@ impl Default for TxOut {
 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
 pub struct Transaction {
     /// The protocol version, is currently expected to be 1 or 2 (BIP 68).
-    pub version: u32,
+    pub version: i32,
     /// Block number before which this transaction is valid, or 0 for
     /// valid immediately.
     pub lock_time: u32,
@@ -531,7 +531,7 @@ impl Encodable for Transaction {
 
 impl Decodable for Transaction {
     fn consensus_decode<D: io::Read>(mut d: D) -> Result<Self, encode::Error> {
-        let version = u32::consensus_decode(&mut d)?;
+        let version = i32::consensus_decode(&mut d)?;
         let input = Vec::<TxIn>::consensus_decode(&mut d)?;
         // segwit
         if input.is_empty() {
@@ -662,7 +662,7 @@ mod tests {
                    Err(ParseOutPointError::Txid(Txid::from_hex("5df6e0e2761359d30a8275058e299fcc0381534545f55cf43e41983f5d4c945X").unwrap_err())));
         assert_eq!(OutPoint::from_str("5df6e0e2761359d30a8275058e299fcc0381534545f55cf43e41983f5d4c9456:lol"),
                    Err(ParseOutPointError::Vout(u32::from_str("lol").unwrap_err())));
- 
+
         assert_eq!(OutPoint::from_str("5df6e0e2761359d30a8275058e299fcc0381534545f55cf43e41983f5d4c9456:42"),
                    Ok(OutPoint{
                        txid: Txid::from_hex("5df6e0e2761359d30a8275058e299fcc0381534545f55cf43e41983f5d4c9456").unwrap(),
@@ -1229,4 +1229,3 @@ mod tests {
         }
     }
 }
-
diff --git a/src/util/bip143.rs b/src/util/bip143.rs
index 8b805e61..59e36961 100644
--- a/src/util/bip143.rs
+++ b/src/util/bip143.rs
@@ -30,7 +30,7 @@ use consensus::encode::Encodable;
 #[derive(Clone, PartialEq, Eq, Debug)]
 #[deprecated(since="0.24.0", note="please use `SigHashCache` instead")]
 pub struct SighashComponents {
-    tx_version: u32,
+    tx_version: i32,
     tx_locktime: u32,
     /// Hash of all the previous outputs
     pub hash_prevouts: SigHash,