diff --git a/cmd/puppeth/wizard_genesis.go b/cmd/puppeth/wizard_genesis.go
index 44b607ce86..10f496f41b 100644
--- a/cmd/puppeth/wizard_genesis.go
+++ b/cmd/puppeth/wizard_genesis.go
@@ -51,7 +51,6 @@ func (w *wizard) makeGenesis() {
 			ByzantiumBlock:      big.NewInt(0),
 			ConstantinopleBlock: big.NewInt(0),
 			PetersburgBlock:     big.NewInt(0),
-			IstanbulBlock:       big.NewInt(0),
 		},
 	}
 	// Figure out which consensus engine to choose
@@ -231,10 +230,6 @@ func (w *wizard) manageGenesis() {
 		fmt.Printf("Which block should Petersburg come into effect? (default = %v)\n", w.conf.Genesis.Config.PetersburgBlock)
 		w.conf.Genesis.Config.PetersburgBlock = w.readDefaultBigInt(w.conf.Genesis.Config.PetersburgBlock)
 
-		fmt.Println()
-		fmt.Printf("Which block should Istanbul come into effect? (default = %v)\n", w.conf.Genesis.Config.IstanbulBlock)
-		w.conf.Genesis.Config.IstanbulBlock = w.readDefaultBigInt(w.conf.Genesis.Config.IstanbulBlock)
-
 		out, _ := json.MarshalIndent(w.conf.Genesis.Config, "", "  ")
 		fmt.Printf("Chain configuration updated:\n\n%s\n", out)