diff --git a/genesis/genesis.go b/genesis/genesis.go
index 4be991501..3d6cdac32 100644
--- a/genesis/genesis.go
+++ b/genesis/genesis.go
@@ -56,7 +56,7 @@ type Genesis struct {
 
 type genesisData struct {
 	GenesisTime time.Time      `cbor:"1,keyasint" json:"genesis_time"`
-	Params      *GenParams     `cbor:"2,keyasint" json:"params"`
+	Params      *genParams     `cbor:"2,keyasint" json:"params"`
 	Accounts    []genAccount   `cbor:"3,keyasint" json:"accounts"`
 	Validators  []genValidator `cbor:"4,keyasint" json:"validators"`
 }
@@ -71,7 +71,7 @@ func (gen *Genesis) GenesisTime() time.Time {
 	return gen.data.GenesisTime
 }
 
-func (gen *Genesis) Params() *GenParams {
+func (gen *Genesis) Params() *genParams {
 	return gen.data.Params
 }
 
@@ -123,7 +123,7 @@ func makeGenesisValidator(val *validator.Validator) genValidator {
 }
 
 func MakeGenesis(genesisTime time.Time, accounts map[crypto.Address]*account.Account,
-	validators []*validator.Validator, params *GenParams,
+	validators []*validator.Validator, params *genParams,
 ) *Genesis {
 	genAccs := make([]genAccount, len(accounts))
 	for addr, acc := range accounts {
diff --git a/genesis/genesis_param.go b/genesis/genesis_param.go
index 620038f10..1ccd64203 100644
--- a/genesis/genesis_param.go
+++ b/genesis/genesis_param.go
@@ -6,7 +6,7 @@ import (
 	"github.com/pactus-project/pactus/types/amount"
 )
 
-type GenParams struct {
+type genParams struct {
 	BlockVersion              uint8         `cbor:"1,keyasint"  json:"block_version"`
 	BlockIntervalInSecond     int           `cbor:"2,keyasint"  json:"block_interval_in_second"`
 	CommitteeSize             int           `cbor:"3,keyasint"  json:"committee_size"`
@@ -22,8 +22,8 @@ type GenParams struct {
 	MaximumStake              amount.Amount `cbor:"13,keyasint" json:"maximum_stake"`
 }
 
-func DefaultGenParams() *GenParams {
-	return &GenParams{
+func DefaultGenParams() *genParams {
+	return &genParams{
 		BlockVersion:              1,
 		BlockIntervalInSecond:     10,
 		CommitteeSize:             51,
@@ -40,6 +40,6 @@ func DefaultGenParams() *GenParams {
 	}
 }
 
-func (p *GenParams) BlockInterval() time.Duration {
+func (p *genParams) BlockInterval() time.Duration {
 	return time.Duration(p.BlockIntervalInSecond) * time.Second
 }