diff --git a/common/geodata/cache.go b/common/geodata/cache.go
index 65ffd066f..9a654e909 100644
--- a/common/geodata/cache.go
+++ b/common/geodata/cache.go
@@ -11,27 +11,27 @@ import (
 	"github.com/p4gefau1t/trojan-go/log"
 )
 
-type GeoIPCache map[string]*v2router.GeoIP
+type geoipCache map[string]*v2router.GeoIP
 
-func (g GeoIPCache) Has(key string) bool {
+func (g geoipCache) Has(key string) bool {
 	return !(g.Get(key) == nil)
 }
 
-func (g GeoIPCache) Get(key string) *v2router.GeoIP {
+func (g geoipCache) Get(key string) *v2router.GeoIP {
 	if g == nil {
 		return nil
 	}
 	return g[key]
 }
 
-func (g GeoIPCache) Set(key string, value *v2router.GeoIP) {
+func (g geoipCache) Set(key string, value *v2router.GeoIP) {
 	if g == nil {
 		g = make(map[string]*v2router.GeoIP)
 	}
 	g[key] = value
 }
 
-func (g GeoIPCache) Unmarshal(filename, code string) (*v2router.GeoIP, error) {
+func (g geoipCache) Unmarshal(filename, code string) (*v2router.GeoIP, error) {
 	asset := common.GetAssetLocation(filename)
 	idx := strings.ToLower(asset + ":" + code)
 	if g.Has(idx) {
@@ -77,27 +77,27 @@ func (g GeoIPCache) Unmarshal(filename, code string) (*v2router.GeoIP, error) {
 	return nil, common.NewError("country code " + code + " not found in " + filename)
 }
 
-type GeoSiteCache map[string]*v2router.GeoSite
+type geositeCache map[string]*v2router.GeoSite
 
-func (g GeoSiteCache) Has(key string) bool {
+func (g geositeCache) Has(key string) bool {
 	return !(g.Get(key) == nil)
 }
 
-func (g GeoSiteCache) Get(key string) *v2router.GeoSite {
+func (g geositeCache) Get(key string) *v2router.GeoSite {
 	if g == nil {
 		return nil
 	}
 	return g[key]
 }
 
-func (g GeoSiteCache) Set(key string, value *v2router.GeoSite) {
+func (g geositeCache) Set(key string, value *v2router.GeoSite) {
 	if g == nil {
 		g = make(map[string]*v2router.GeoSite)
 	}
 	g[key] = value
 }
 
-func (g GeoSiteCache) Unmarshal(filename, code string) (*v2router.GeoSite, error) {
+func (g geositeCache) Unmarshal(filename, code string) (*v2router.GeoSite, error) {
 	asset := common.GetAssetLocation(filename)
 	idx := strings.ToLower(asset + ":" + code)
 	if g.Has(idx) {
diff --git a/common/geodata/decode_test.go b/common/geodata/decode_test.go
index f210aee7a..d4b84d389 100644
--- a/common/geodata/decode_test.go
+++ b/common/geodata/decode_test.go
@@ -72,7 +72,7 @@ func BenchmarkLoadGeoIP(b *testing.B) {
 	m1 := runtime.MemStats{}
 	m2 := runtime.MemStats{}
 
-	loader := geodata.GetGeodataLoader()
+	loader := geodata.NewGeodataLoader()
 
 	runtime.ReadMemStats(&m1)
 	cn, _ := loader.LoadGeoIP("cn")
@@ -89,7 +89,7 @@ func BenchmarkLoadGeoSite(b *testing.B) {
 	m3 := runtime.MemStats{}
 	m4 := runtime.MemStats{}
 
-	loader := geodata.GetGeodataLoader()
+	loader := geodata.NewGeodataLoader()
 
 	runtime.ReadMemStats(&m3)
 	cn, _ := loader.LoadGeoSite("cn")
diff --git a/common/geodata/interface.go b/common/geodata/interface.go
new file mode 100644
index 000000000..f40dac66e
--- /dev/null
+++ b/common/geodata/interface.go
@@ -0,0 +1,10 @@
+package geodata
+
+import v2router "github.com/v2fly/v2ray-core/v4/app/router"
+
+type GeodataLoader interface {
+	LoadIP(filename, country string) ([]*v2router.CIDR, error)
+	LoadSite(filename, list string) ([]*v2router.Domain, error)
+	LoadGeoIP(country string) ([]*v2router.CIDR, error)
+	LoadGeoSite(list string) ([]*v2router.Domain, error)
+}
diff --git a/common/geodata/loader.go b/common/geodata/loader.go
index 62838de53..bf6f10548 100644
--- a/common/geodata/loader.go
+++ b/common/geodata/loader.go
@@ -6,27 +6,20 @@ import (
 	v2router "github.com/v2fly/v2ray-core/v4/app/router"
 )
 
-type geodataLoader interface {
-	LoadIP(filename, country string) ([]*v2router.CIDR, error)
-	LoadSite(filename, list string) ([]*v2router.Domain, error)
-	LoadGeoIP(country string) ([]*v2router.CIDR, error)
-	LoadGeoSite(list string) ([]*v2router.Domain, error)
+type geodataCache struct {
+	geoipCache
+	geositeCache
 }
 
-func GetGeodataLoader() geodataLoader {
+func NewGeodataLoader() GeodataLoader {
 	return &geodataCache{
 		make(map[string]*v2router.GeoIP),
 		make(map[string]*v2router.GeoSite),
 	}
 }
 
-type geodataCache struct {
-	GeoIPCache
-	GeoSiteCache
-}
-
 func (g *geodataCache) LoadIP(filename, country string) ([]*v2router.CIDR, error) {
-	geoip, err := g.GeoIPCache.Unmarshal(filename, country)
+	geoip, err := g.geoipCache.Unmarshal(filename, country)
 	if err != nil {
 		return nil, err
 	}
@@ -35,7 +28,7 @@ func (g *geodataCache) LoadIP(filename, country string) ([]*v2router.CIDR, error
 }
 
 func (g *geodataCache) LoadSite(filename, list string) ([]*v2router.Domain, error) {
-	geosite, err := g.GeoSiteCache.Unmarshal(filename, list)
+	geosite, err := g.geositeCache.Unmarshal(filename, list)
 	if err != nil {
 		return nil, err
 	}
diff --git a/tunnel/router/client.go b/tunnel/router/client.go
index 265ecf497..33ed00a49 100644
--- a/tunnel/router/client.go
+++ b/tunnel/router/client.go
@@ -312,7 +312,7 @@ func NewClient(ctx context.Context, underlay tunnel.Client) (*Client, error) {
 
 	runtime.ReadMemStats(&m1)
 
-	geodataLoader := geodata.GetGeodataLoader()
+	geodataLoader := geodata.NewGeodataLoader()
 
 	ipCode := loadCode(cfg, "geoip:")
 	for _, c := range ipCode {