diff --git a/config/config.go b/config/config.go
index 127bfb7..7326925 100644
--- a/config/config.go
+++ b/config/config.go
@@ -98,6 +98,7 @@ var DefaultChainConfig = &ChainConfig{
 	ConstantinopleBlock: 0,
 	PetersburgBlock:     0,
 	IstanbulBlock:       0,
+	BerlinBlock:         0,
 }
 
 func (c *ChainConfig) Config() (*params.ChainConfig, error) {