diff --git a/zkevm-circuits/src/evm_circuit/param.rs b/zkevm-circuits/src/evm_circuit/param.rs
index c06b2a740e5..2b6e7a1bad1 100644
--- a/zkevm-circuits/src/evm_circuit/param.rs
+++ b/zkevm-circuits/src/evm_circuit/param.rs
@@ -128,8 +128,8 @@ pub(crate) const N_BYTES_BLOCK: usize = N_BYTES_COINBASE
 pub(crate) const N_BYTES_EXTRA_VALUE: usize = N_BYTES_WORD + N_BYTES_WORD;
 
 // Number of bytes that will be used for tx values
-pub(crate) const N_BYTES_TX_NONCE: usize = N_BYTES_WORD;
-pub(crate) const N_BYTES_TX_GAS_LIMIT: usize = N_BYTES_WORD; // gas limit type is U256, different with gas U64
+pub(crate) const N_BYTES_TX_NONCE: usize = N_BYTES_U64;
+pub(crate) const N_BYTES_TX_GAS_LIMIT: usize = N_BYTES_U64; // gas limit type is U256, different with gas U64
 pub(crate) const N_BYTES_TX_GASPRICE: usize = N_BYTES_WORD;
 pub(crate) const N_BYTES_TX_FROM: usize = N_BYTES_ACCOUNT_ADDRESS;
 pub(crate) const N_BYTES_TX_TO: usize = N_BYTES_ACCOUNT_ADDRESS;
diff --git a/zkevm-circuits/src/instance.rs b/zkevm-circuits/src/instance.rs
index b7c25860c83..39fd4b71042 100644
--- a/zkevm-circuits/src/instance.rs
+++ b/zkevm-circuits/src/instance.rs
@@ -40,9 +40,9 @@ pub struct BlockValues {
 #[derive(Default, Debug, Clone)]
 pub struct TxValues {
     /// nonce
-    pub nonce: Word,
+    pub nonce: u64,
     /// gas_limit
-    pub gas_limit: Word,
+    pub gas_limit: u64,
     /// gas_price
     pub gas_price: Word,
     /// from_addr
@@ -139,9 +139,9 @@ impl PublicData {
             let mut msg_hash_le = [0u8; 32];
             msg_hash_le.copy_from_slice(sign_data.msg_hash.to_bytes().as_slice());
             tx_vals.push(TxValues {
-                nonce: tx.nonce,
+                nonce: tx.nonce.low_u64(),
                 gas_price: tx.gas_price,
-                gas_limit: tx.gas_limit,
+                gas_limit: tx.gas_limit.low_u64(),
                 from_addr: tx.from,
                 to_addr: tx.to.unwrap_or_else(Address::zero),
                 is_create: (tx.to.is_none() as u64),