diff --git a/README.md b/README.md
index 4bab903..71ddaf7 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ func main() {
 		fmt.Printf("English subdivision name: %v\n", record.Subdivisions[0].Names["en"])
 	}
 	fmt.Printf("Russian country name: %v\n", record.Country.Names["ru"])
-	fmt.Printf("ISO country code: %v\n", record.Country.IsoCode)
+	fmt.Printf("ISO country code: %v\n", record.Country.ISOCode)
 	fmt.Printf("Time zone: %v\n", record.Location.TimeZone)
 	fmt.Printf("Coordinates: %v, %v\n", record.Location.Latitude, record.Location.Longitude)
 	// Output:
diff --git a/example_test.go b/example_test.go
index 2597077..b681db3 100644
--- a/example_test.go
+++ b/example_test.go
@@ -23,7 +23,7 @@ func Example() {
 	fmt.Printf("Portuguese (BR) city name: %v\n", record.City.Names.PtBR)
 	fmt.Printf("English subdivision name: %v\n", record.Subdivisions[0].Names.En)
 	fmt.Printf("Russian country name: %v\n", record.Country.Names.Ru)
-	fmt.Printf("ISO country code: %v\n", record.Country.IsoCode)
+	fmt.Printf("ISO country code: %v\n", record.Country.ISOCode)
 	fmt.Printf("Time zone: %v\n", record.Location.TimeZone)
 	fmt.Printf("Coordinates: %v, %v\n", record.Location.Latitude, record.Location.Longitude)
 	// Output:
diff --git a/reader.go b/reader.go
index a57d117..f3c99eb 100644
--- a/reader.go
+++ b/reader.go
@@ -41,7 +41,7 @@ type Enterprise struct {
 	} `maxminddb:"continent" json:"continent,omitempty"`
 	Country struct {
 		GeoNameID         uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
-		IsoCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names             Names  `maxminddb:"names" json:"names,omitempty"`
 		Confidence        uint8  `maxminddb:"confidence" json:"confidence,omitempty"`
 		IsInEuropeanUnion bool   `maxminddb:"is_in_european_union" json:"is_in_european_union,omitempty"`
@@ -59,7 +59,7 @@ type Enterprise struct {
 	} `maxminddb:"postal" json:"postal,omitempty"`
 	RegisteredCountry struct {
 		GeoNameID         uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
-		IsoCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names             Names  `maxminddb:"names" json:"names,omitempty"`
 		Confidence        uint8  `maxminddb:"confidence" json:"confidence,omitempty"`
 		IsInEuropeanUnion bool   `maxminddb:"is_in_european_union" json:"is_in_european_union,omitempty"`
@@ -67,14 +67,14 @@ type Enterprise struct {
 	RepresentedCountry struct {
 		GeoNameID         uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
 		IsInEuropeanUnion bool   `maxminddb:"is_in_european_union" json:"is_in_european_union,omitempty"`
-		IsoCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names             Names  `maxminddb:"names" json:"names,omitempty"`
 		Type              string `maxminddb:"type" json:"type,omitempty"`
 	} `maxminddb:"represented_country" json:"represented_country,omitempty"`
 	Subdivisions []struct {
 		Confidence uint8  `maxminddb:"confidence" json:"confidence,omitempty"`
 		GeoNameID  uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
-		IsoCode    string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode    string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names      Names  `maxminddb:"names" json:"names,omitempty"`
 	} `maxminddb:"subdivisions" json:"subdivisions,omitempty"`
 	Traits struct {
@@ -107,7 +107,7 @@ type City struct {
 	Country struct {
 		GeoNameID         uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
 		IsInEuropeanUnion bool   `maxminddb:"is_in_european_union" json:"is_in_european_union,omitempty"`
-		IsoCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names             Names  `maxminddb:"names" json:"names,omitempty"`
 	} `maxminddb:"country" json:"country,omitempty"`
 	Location struct {
@@ -123,19 +123,19 @@ type City struct {
 	RegisteredCountry struct {
 		GeoNameID         uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
 		IsInEuropeanUnion bool   `maxminddb:"is_in_european_union" json:"is_in_european_union,omitempty"`
-		IsoCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names             Names  `maxminddb:"names" json:"names,omitempty"`
 	} `maxminddb:"registered_country" json:"registered_country,omitempty"`
 	RepresentedCountry struct {
 		GeoNameID         uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
 		IsInEuropeanUnion bool   `maxminddb:"is_in_european_union" json:"is_in_european_union,omitempty"`
-		IsoCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names             Names  `maxminddb:"names" json:"names,omitempty"`
 		Type              string `maxminddb:"type" json:"type,omitempty"`
 	} `maxminddb:"represented_country" json:"represented_country,omitempty"`
 	Subdivisions []struct {
 		GeoNameID uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
-		IsoCode   string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode   string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names     Names  `maxminddb:"names" json:"names,omitempty"`
 	} `maxminddb:"subdivisions" json:"subdivisions,omitempty"`
 	Traits struct {
@@ -155,19 +155,19 @@ type Country struct {
 	Country struct {
 		GeoNameID         uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
 		IsInEuropeanUnion bool   `maxminddb:"is_in_european_union" json:"is_in_european_union,omitempty"`
-		IsoCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names             Names  `maxminddb:"names" json:"names,omitempty"`
 	} `maxminddb:"country" json:"country,omitempty"`
 	RegisteredCountry struct {
 		GeoNameID         uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
 		IsInEuropeanUnion bool   `maxminddb:"is_in_european_union" json:"is_in_european_union,omitempty"`
-		IsoCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names             Names  `maxminddb:"names" json:"names,omitempty"`
 	} `maxminddb:"registered_country" json:"registered_country,omitempty"`
 	RepresentedCountry struct {
 		GeoNameID         uint   `maxminddb:"geoname_id" json:"geoname_id,omitempty"`
 		IsInEuropeanUnion bool   `maxminddb:"is_in_european_union" json:"is_in_european_union,omitempty"`
-		IsoCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
+		ISOCode           string `maxminddb:"iso_code" json:"iso_code,omitempty"`
 		Names             Names  `maxminddb:"names" json:"names,omitempty"`
 		Type              string `maxminddb:"type" json:"type,omitempty"`
 	} `maxminddb:"represented_country" json:"represented_country,omitempty"`
diff --git a/reader_test.go b/reader_test.go
index fb453c3..7bdd78d 100644
--- a/reader_test.go
+++ b/reader_test.go
@@ -66,7 +66,7 @@ func TestReader(t *testing.T) {
 
 	assert.Equal(t, uint(2635167), record.Country.GeoNameID)
 	assert.True(t, record.Country.IsInEuropeanUnion)
-	assert.Equal(t, "GB", record.Country.IsoCode)
+	assert.Equal(t, "GB", record.Country.ISOCode)
 	assert.Equal(t,
 		Names {
 			De:    "Vereinigtes Königreich",
@@ -87,7 +87,7 @@ func TestReader(t *testing.T) {
 	assert.Equal(t, "Europe/London", record.Location.TimeZone)
 
 	assert.Equal(t, uint(6269131), record.Subdivisions[0].GeoNameID)
-	assert.Equal(t, "ENG", record.Subdivisions[0].IsoCode)
+	assert.Equal(t, "ENG", record.Subdivisions[0].ISOCode)
 	assert.Equal(t,
 	Names {
 			En:    "England",
@@ -100,7 +100,7 @@ func TestReader(t *testing.T) {
 
 	assert.Equal(t, uint(6252001), record.RegisteredCountry.GeoNameID)
 	assert.False(t, record.RegisteredCountry.IsInEuropeanUnion)
-	assert.Equal(t, "US", record.RegisteredCountry.IsoCode)
+	assert.Equal(t, "US", record.RegisteredCountry.ISOCode)
 	assert.Equal(t,
 	Names{
 			De:    "USA",