diff --git a/params/config.go b/params/config.go
index dc02c7ca37..2313b03f16 100644
--- a/params/config.go
+++ b/params/config.go
@@ -82,16 +82,16 @@ var (
 	//
 	// This configuration is intentionally not using keyed fields to force anyone
 	// adding flags to the config to also have to set these fields.
-	AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil}
+	AllEthashProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil, nil}
 
 	// AllCliqueProtocolChanges contains every protocol change (EIPs) introduced
 	// and accepted by the Ethereum core developers into the Clique consensus.
 	//
 	// This configuration is intentionally not using keyed fields to force anyone
 	// adding flags to the config to also have to set these fields.
-	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}}
+	AllCliqueProtocolChanges = &ChainConfig{big.NewInt(1337), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, nil, &CliqueConfig{Period: 0, Epoch: 30000}, nil}
 
-	TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil}
+	TestChainConfig = &ChainConfig{big.NewInt(1), big.NewInt(0), nil, false, big.NewInt(0), common.Hash{}, big.NewInt(0), big.NewInt(0), big.NewInt(0), nil, new(EthashConfig), nil, nil}
 	TestRules       = TestChainConfig.Rules(new(big.Int))
 )
 
@@ -119,8 +119,9 @@ type ChainConfig struct {
 	ConstantinopleBlock *big.Int `json:"constantinopleBlock,omitempty"` // Constantinople switch block (nil = no fork, 0 = already activated)
 
 	// Various consensus engines
-	Ethash *EthashConfig `json:"ethash,omitempty"`
-	Clique *CliqueConfig `json:"clique,omitempty"`
+	Ethash   *EthashConfig   `json:"ethash,omitempty"`
+	Clique   *CliqueConfig   `json:"clique,omitempty"`
+	Istanbul *IstanbulConfig `json:"istanbul,omitempty"`
 }
 
 // EthashConfig is the consensus engine configs for proof-of-work based sealing.
@@ -142,6 +143,17 @@ func (c *CliqueConfig) String() string {
 	return "clique"
 }
 
+// IstanbulConfig is the consensus engine configs for Istanbul based sealing.
+type IstanbulConfig struct {
+	Epoch          uint64 `json:"epoch"`  // Epoch length to reset votes and checkpoint
+	ProposerPolicy uint64 `json:"policy"` // The policy for proposer selection
+}
+
+// String implements the stringer interface, returning the consensus engine details.
+func (c *IstanbulConfig) String() string {
+	return "istanbul"
+}
+
 // String implements the fmt.Stringer interface.
 func (c *ChainConfig) String() string {
 	var engine interface{}
@@ -150,6 +162,8 @@ func (c *ChainConfig) String() string {
 		engine = c.Ethash
 	case c.Clique != nil:
 		engine = c.Clique
+	case c.Istanbul != nil:
+		engine = c.Istanbul
 	default:
 		engine = "unknown"
 	}