diff --git a/core/genesis.go b/core/genesis.go
index 19890406ef..dc50ff475e 100644
--- a/core/genesis.go
+++ b/core/genesis.go
@@ -415,7 +415,10 @@ func DefaultCalaverasGenesisBlock() *Genesis {
 func DeveloperGenesisBlock(period uint64, faucet common.Address) *Genesis {
 	// Override the default period to the user requested one
 	config := *params.AllCliqueProtocolChanges
-	config.Clique.Period = period
+	config.Clique = &params.CliqueConfig{
+		Period: period,
+		Epoch:  config.Clique.Epoch,
+	}
 
 	// Assemble and return the genesis with the precompiles and faucet pre-funded
 	return &Genesis{