diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 4384401fb0d..0c75f31a6f0 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -138,6 +138,10 @@ var (
 		Name:  "override.terminaltotaldifficulty",
 		Usage: "Manually specify TerminalTotalDifficulty, overriding the bundled setting",
 	}
+	OverrideMergeForkBlock = BigFlag{
+		Name:  "override.mergeForkBlock",
+		Usage: "Manually specify TerminalTotalDifficulty, overriding the bundled setting",
+	}
 	// Ethash settings
 	EthashCachesInMemoryFlag = cli.IntFlag{
 		Name:  "ethash.cachesinmem",
@@ -1500,6 +1504,9 @@ func SetEthConfig(ctx *cli.Context, nodeConfig *node.Config, cfg *ethconfig.Conf
 	if ctx.GlobalIsSet(OverrideTerminalTotalDifficulty.Name) {
 		cfg.Genesis.Config.TerminalTotalDifficulty = GlobalBig(ctx, OverrideTerminalTotalDifficulty.Name)
 	}
+	if ctx.GlobalIsSet(OverrideMergeForkBlock.Name) {
+		cfg.Genesis.Config.MergeForkBlock = GlobalBig(ctx, OverrideMergeForkBlock.Name)
+	}
 }
 
 // SetDNSDiscoveryDefaults configures DNS discovery with the given URL if
diff --git a/turbo/cli/default_flags.go b/turbo/cli/default_flags.go
index f66bf3821b8..60a0105c98f 100644
--- a/turbo/cli/default_flags.go
+++ b/turbo/cli/default_flags.go
@@ -125,4 +125,5 @@ var DefaultFlags = []cli.Flag{
 	utils.WithoutHeimdallFlag,
 	utils.EthStatsURLFlag,
 	utils.OverrideTerminalTotalDifficulty,
+	utils.OverrideMergeForkBlock,
 }