diff --git a/core/types/transaction_signing.go b/core/types/transaction_signing.go
index e1458316a..51057a55b 100644
--- a/core/types/transaction_signing.go
+++ b/core/types/transaction_signing.go
@@ -20,11 +20,11 @@ import (
 	"crypto/ecdsa"
 	"errors"
 	"fmt"
-	"github.com/ethereum/go-ethereum/log"
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 )
 
@@ -41,19 +41,22 @@ type sigCache struct {
 func MakeSigner(config *params.ChainConfig, blockNumber *big.Int) Signer {
 	var signer Signer
 
-	// ethereum mainnet chainID is 1
-	// required to validate transactions on mainnet
-	chainID := big.NewInt(1)
+	chainID := config.ChainID
+	if config.PrimordialPulseAhead(blockNumber) {
+		// ethereum mainnet chainID is 1
+		// required to validate transactions on mainnet
+		chainID = big.NewInt(1)
+	}
 
 	switch {
 	case config.IsPrimordialPulse(blockNumber):
 		signer = NewLondonSigner(chainID)
 	case config.IsLondon(blockNumber):
-		signer = NewLondonSigner(config.ChainID)
+		signer = NewLondonSigner(chainID)
 	case config.IsBerlin(blockNumber):
-		signer = NewEIP2930Signer(config.ChainID)
+		signer = NewEIP2930Signer(chainID)
 	case config.IsEIP155(blockNumber):
-		signer = NewEIP155Signer(config.ChainID)
+		signer = NewEIP155Signer(chainID)
 	case config.IsHomestead(blockNumber):
 		signer = HomesteadSigner{}
 	default:
diff --git a/core/vm/evm.go b/core/vm/evm.go
index 6727e5e48..44803f1d7 100644
--- a/core/vm/evm.go
+++ b/core/vm/evm.go
@@ -127,7 +127,7 @@ type EVM struct {
 func NewEVM(blockCtx BlockContext, txCtx TxContext, statedb StateDB, chainConfig *params.ChainConfig, config Config) *EVM {
 	msgChainConfig := chainConfig
 
-	if !chainConfig.IsPrimordialPulse(blockCtx.BlockNumber) {
+	if chainConfig.PrimordialPulseAhead(blockCtx.BlockNumber) {
 		// create a shallow of chainConfig struct and set to ethereum mainnet
 		chainCfgCpy := *chainConfig
 		chainCfgCpy.ChainID = big.NewInt(1)
diff --git a/params/config.go b/params/config.go
index 8916ff44a..e8b5fcef8 100644
--- a/params/config.go
+++ b/params/config.go
@@ -80,7 +80,7 @@ var (
 		SectionHead:  common.HexToHash("0x50fd3cec5376ede90ef9129772022690cd1467f22c18abb7faa11e793c51e9c9"),
 		CHTRoot:      common.HexToHash("0xb57b4b22a77b5930847b1ca9f62daa11eae6578948cb7b18997f2c0fe5757025"),
 		BloomRoot:    common.HexToHash("0xa338f8a868a194fa90327d0f5877f656a9f3640c618d2a01a01f2e76ef9ef954"),
-}
+	}
 
 	// MainnetCheckpointOracle contains a set of configs for the main network oracle.
 	MainnetCheckpointOracle = &CheckpointOracleConfig{
@@ -649,7 +649,7 @@ func (c *ChainConfig) IsPrimordialPulseBlock(number uint64) bool {
 }
 
 // Returns true if there is a PrimordialPulse block in the future, indicating this chain
-// should still be evaluated using the ethash consensus engine.
+// should still be evaluated using the ethash consensus engine and with mainnet ChainID.
 func (c *ChainConfig) PrimordialPulseAhead(number *big.Int) bool {
 	return c.PrimordialPulseBlock != nil && c.PrimordialPulseBlock.Cmp(number) > 0
 }