diff --git a/params/config_kotti.go b/params/config_kotti.go
index a7098798f9fc..680387537354 100644
--- a/params/config_kotti.go
+++ b/params/config_kotti.go
@@ -36,10 +36,11 @@ var (
 		EIP155Block:         big.NewInt(0),
 		EIP158Block:         big.NewInt(716617),
 		ByzantiumBlock:      big.NewInt(716617),
+		ConstantinopleBlock: big.NewInt(1705549),
+		PetersburgBlock:     big.NewInt(1705549),
 		DisposalBlock:       big.NewInt(0),
 		SocialBlock:         nil,
 		EthersocialBlock:    nil,
-		ConstantinopleBlock: nil,
 		ECIP1017EraRounds:   big.NewInt(5000000),
 		EIP160FBlock:        big.NewInt(0),
 		ECIP1010PauseBlock:  big.NewInt(0),
diff --git a/params/config_mordor.go b/params/config_mordor.go
index 1f1ab0d833ef..2f3df4320d27 100644
--- a/params/config_mordor.go
+++ b/params/config_mordor.go
@@ -28,7 +28,8 @@ var (
 		EIP155Block:         big.NewInt(0),
 		EIP158Block:         big.NewInt(0),
 		ByzantiumBlock:      big.NewInt(0),
-		ConstantinopleBlock: nil,
+		ConstantinopleBlock: big.NewInt(301243),
+		PetersburgBlock:     big.NewInt(301243),
 		DisposalBlock:       big.NewInt(0),
 		ECIP1017EraRounds:   big.NewInt(2000000),
 		EIP160FBlock:        big.NewInt(0),