diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index ef5f6a9f0..41a1ac35f 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -1084,6 +1084,9 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
 		}
 		cfg.Genesis = core.DefaultRinkebyGenesisBlock()
 	case ctx.GlobalBool(DeveloperFlag.Name):
+		if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
+			cfg.NetworkId = 1337
+		}
 		// Create new developer account or reuse existing one
 		var (
 			developer accounts.Account