diff --git a/vm/chain_config.go b/vm/chain_config.go
index fdc9ce765..6ad7b1c19 100644
--- a/vm/chain_config.go
+++ b/vm/chain_config.go
@@ -23,7 +23,7 @@ func isForked(s, head *big.Int) bool {
 type ChainConfig struct {
 	params.ChainConfig
 	IstanbulBlock  *big.Int `json:"istanbulBlock,omitempty"`  // Istanbul switch block (nil = no fork, 0 = already on istanbul)
-	GalacticaBlock *big.Int `json:"GalacticaBlock,omitempty"` // Galactica switch block (nil = no fork, 0 = already on galactica)
+	GalacticaBlock *big.Int `json:"galacticaBlock,omitempty"` // Galactica switch block (nil = no fork, 0 = already on galactica)
 }
 
 // IsIstanbul returns whether num is either equal to the Istanbul fork block or greater.