diff --git a/cmd/geth/config.go b/cmd/geth/config.go
index 71e835534..01ca0a9cf 100644
--- a/cmd/geth/config.go
+++ b/cmd/geth/config.go
@@ -20,7 +20,6 @@ import (
 	"bufio"
 	"errors"
 	"fmt"
-	"math/big"
 	"os"
 	"reflect"
 	"unicode"
@@ -147,12 +146,6 @@ func enableWhisper(ctx *cli.Context) bool {
 
 func makeFullNode(ctx *cli.Context) *node.Node {
 	stack, cfg := makeConfigNode(ctx)
-	if ctx.GlobalIsSet(utils.OverrideIstanbulFlag.Name) {
-		cfg.Eth.OverrideIstanbul = new(big.Int).SetUint64(ctx.GlobalUint64(utils.OverrideIstanbulFlag.Name))
-	}
-	if ctx.GlobalIsSet(utils.OverrideMuirGlacierFlag.Name) {
-		cfg.Eth.OverrideMuirGlacier = new(big.Int).SetUint64(ctx.GlobalUint64(utils.OverrideMuirGlacierFlag.Name))
-	}
 	utils.RegisterEthService(stack, &cfg.Eth)
 
 	// Whisper must be explicitly enabled by specifying at least 1 whisper flag or in dev mode
diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index 0d734e566..84342a16d 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -69,8 +69,6 @@ var (
 		utils.ExternalSignerFlag,
 		utils.NoUSBFlag,
 		utils.SmartCardDaemonPathFlag,
-		utils.OverrideIstanbulFlag,
-		utils.OverrideMuirGlacierFlag,
 		utils.EthashCacheDirFlag,
 		utils.EthashCachesInMemoryFlag,
 		utils.EthashCachesOnDiskFlag,
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 00bbaf50e..6527d21dc 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -241,14 +241,6 @@ var (
 		Name:  "whitelist",
 		Usage: "Comma separated block number-to-hash mappings to enforce (<number>=<hash>)",
 	}
-	OverrideIstanbulFlag = cli.Uint64Flag{
-		Name:  "override.istanbul",
-		Usage: "Manually specify Istanbul fork-block, overriding the bundled setting",
-	}
-	OverrideMuirGlacierFlag = cli.Uint64Flag{
-		Name:  "override.muirglacier",
-		Usage: "Manually specify Muir Glacier fork-block, overriding the bundled setting",
-	}
 	// Light server and client settings
 	LightLegacyServFlag = cli.IntFlag{ // Deprecated in favor of light.serve, remove in 2021
 		Name:  "lightserv",
diff --git a/core/genesis.go b/core/genesis.go
index b31980f0a..3528262b5 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -152,10 +152,6 @@ func (e *GenesisMismatchError) Error() string {
 //
 // The returned chain configuration is never nil.
 func SetupGenesisBlock(db ethdb.Database, genesis *Genesis) (*params.ChainConfig, common.Hash, error) {
-	return SetupGenesisBlockWithOverride(db, genesis, nil, nil)
-}
-
-func SetupGenesisBlockWithOverride(db ethdb.Database, genesis *Genesis, overrideIstanbul, overrideMuirGlacier *big.Int) (*params.ChainConfig, common.Hash, error) {
 	if genesis != nil && genesis.Config == nil {
 		return params.AllEthashProtocolChanges, common.Hash{}, errGenesisNoConfig
 	}
@@ -204,12 +200,6 @@ func SetupGenesisBlockWithOverride(db ethdb.Database, genesis *Genesis, override
 
 	// Get the existing chain configuration.
 	newcfg := genesis.configOrDefault(stored)
-	if overrideIstanbul != nil {
-		newcfg.IstanbulBlock = overrideIstanbul
-	}
-	if overrideMuirGlacier != nil {
-		newcfg.MuirGlacierBlock = overrideMuirGlacier
-	}
 	if err := newcfg.CheckConfigForkOrder(); err != nil {
 		return newcfg, common.Hash{}, err
 	}
diff --git a/eth/backend.go b/eth/backend.go
index 98eee91e1..c669fa974 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -136,7 +136,7 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 	if err != nil {
 		return nil, err
 	}
-	chainConfig, genesisHash, genesisErr := core.SetupGenesisBlockWithOverride(chainDb, config.Genesis, config.OverrideIstanbul, config.OverrideMuirGlacier)
+	chainConfig, genesisHash, genesisErr := core.SetupGenesisBlock(chainDb, config.Genesis)
 	if _, ok := genesisErr.(*params.ConfigCompatError); genesisErr != nil && !ok {
 		return nil, genesisErr
 	}
diff --git a/eth/config.go b/eth/config.go
index 20480f742..57e14eb6e 100644
--- a/eth/config.go
+++ b/eth/config.go
@@ -162,10 +162,4 @@ type Config struct {
 
 	// CheckpointOracle is the configuration for checkpoint oracle.
 	CheckpointOracle *params.CheckpointOracleConfig `toml:",omitempty"`
-
-	// Istanbul block override (TODO: remove after the fork)
-	OverrideIstanbul *big.Int `toml:",omitempty"`
-
-	// MuirGlacier block override (TODO: remove after the fork)
-	OverrideMuirGlacier *big.Int `toml:",omitempty"`
 }
diff --git a/eth/gen_config.go b/eth/gen_config.go
index 1c659c393..73c9b8579 100644
--- a/eth/gen_config.go
+++ b/eth/gen_config.go
@@ -86,8 +86,6 @@ func (c Config) MarshalTOML() (interface{}, error) {
 	enc.RPCGasCap = c.RPCGasCap
 	enc.Checkpoint = c.Checkpoint
 	enc.CheckpointOracle = c.CheckpointOracle
-	enc.OverrideIstanbul = c.OverrideIstanbul
-	enc.OverrideMuirGlacier = c.OverrideMuirGlacier
 	return &enc, nil
 }
 
@@ -229,11 +227,5 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 	if dec.CheckpointOracle != nil {
 		c.CheckpointOracle = dec.CheckpointOracle
 	}
-	if dec.OverrideIstanbul != nil {
-		c.OverrideIstanbul = dec.OverrideIstanbul
-	}
-	if dec.OverrideMuirGlacier != nil {
-		c.OverrideMuirGlacier = dec.OverrideMuirGlacier
-	}
 	return nil
 }
diff --git a/les/client.go b/les/client.go
index 94ac4ce84..2ac3285d8 100644
--- a/les/client.go
+++ b/les/client.go
@@ -81,8 +81,7 @@ func New(ctx *node.ServiceContext, config *eth.Config) (*LightEthereum, error) {
 	if err != nil {
 		return nil, err
 	}
-	chainConfig, genesisHash, genesisErr := core.SetupGenesisBlockWithOverride(chainDb, config.Genesis,
-		config.OverrideIstanbul, config.OverrideMuirGlacier)
+	chainConfig, genesisHash, genesisErr := core.SetupGenesisBlock(chainDb, config.Genesis)
 	if _, isCompat := genesisErr.(*params.ConfigCompatError); genesisErr != nil && !isCompat {
 		return nil, genesisErr
 	}