diff --git a/cmd/geth/chaincmd.go b/cmd/geth/chaincmd.go
index 0aacb0878a..98ed348d8c 100644
--- a/cmd/geth/chaincmd.go
+++ b/cmd/geth/chaincmd.go
@@ -325,7 +325,7 @@ func dumpGenesis(ctx *cli.Context) error {
 	var genesis *core.Genesis
 	if utils.IsNetworkPreset(ctx) {
 		genesis = utils.MakeGenesis(ctx)
-	} else if ctx.IsSet(utils.DeveloperFlag.Name) && !ctx.IsSet(utils.DataDirFlag.Name) {
+	} else if ctx.Bool(utils.DeveloperFlag.Name) && !ctx.IsSet(utils.DataDirFlag.Name) {
 		genesis = core.DeveloperGenesisBlock(11_500_000, nil)
 	}
 
diff --git a/cmd/geth/config.go b/cmd/geth/config.go
index 31f19e7a32..c02e307bdc 100644
--- a/cmd/geth/config.go
+++ b/cmd/geth/config.go
@@ -291,7 +291,7 @@ func makeFullNode(ctx *cli.Context) *node.Node {
 	}
 	utils.RegisterSyncOverrideService(stack, eth, syncConfig)
 
-	if ctx.IsSet(utils.DeveloperFlag.Name) {
+	if ctx.Bool(utils.DeveloperFlag.Name) {
 		// Start dev mode.
 		simBeacon, err := catalyst.NewSimulatedBeacon(ctx.Uint64(utils.DeveloperPeriodFlag.Name), cfg.Eth.Miner.PendingFeeRecipient, eth)
 		if err != nil {