diff --git a/cmd/avrogen/main.go b/cmd/avrogen/main.go
index c89f2d9..3d4cbe8 100644
--- a/cmd/avrogen/main.go
+++ b/cmd/avrogen/main.go
@@ -146,6 +146,8 @@ func parseTags(raw string) (map[string]gen.TagStyle, error) {
 			style = gen.Kebab
 		case string(gen.Snake):
 			style = gen.Snake
+		case string(gen.Original):
+			style = gen.Original
 		default:
 			return nil, fmt.Errorf("style %q is invalid in %q", parts[1], tag)
 		}
diff --git a/cmd/avrogen/main_test.go b/cmd/avrogen/main_test.go
index 97eb97d..dc6a5b6 100644
--- a/cmd/avrogen/main_test.go
+++ b/cmd/avrogen/main_test.go
@@ -164,6 +164,10 @@ func TestParseTags(t *testing.T) {
 			name: "kebab case",
 			tags: "json:kebab",
 		},
+		{
+			name: "original case",
+			tags: "json:original",
+		},
 	}
 
 	for _, test := range tests {
diff --git a/gen/gen.go b/gen/gen.go
index b57d495..5d8c081 100644
--- a/gen/gen.go
+++ b/gen/gen.go
@@ -27,6 +27,8 @@ type Config struct {
 type TagStyle string
 
 const (
+	// Original is a style like whAtEVer_IS_InthEInpuT.
+	Original TagStyle = "original"
 	// Snake is a style like im_written_in_snake_case.
 	Snake TagStyle = "snake"
 	// Camel is a style like imWrittenInCamelCase.
@@ -355,6 +357,8 @@ func formatTag(tag string, style TagStyle) string {
 		return strcase.ToCamel(tag)
 	case Snake:
 		return strcase.ToSnake(tag)
+	case Original:
+		fallthrough
 	default:
 		return tag
 	}
diff --git a/gen/gen_test.go b/gen/gen_test.go
index 2399880..6dd4411 100644
--- a/gen/gen_test.go
+++ b/gen/gen_test.go
@@ -98,7 +98,7 @@ func TestStruct_ConfigurableFieldTags(t *testing.T) {
   "type": "record",
   "name": "test",
   "fields": [
-    { "name": "someString", "type": "string" }
+    { "name": "someSTRING", "type": "string" }
   ]
 }`
 
@@ -110,7 +110,8 @@ func TestStruct_ConfigurableFieldTags(t *testing.T) {
 		{tagStyle: gen.Snake, expectedTag: "json:\"some_string\""},
 		{tagStyle: gen.Kebab, expectedTag: "json:\"some-string\""},
 		{tagStyle: gen.UpperCamel, expectedTag: "json:\"SomeString\""},
-		{tagStyle: gen.TagStyle(""), expectedTag: "json:\"someString\""},
+		{tagStyle: gen.Original, expectedTag: "json:\"someSTRING\""},
+		{tagStyle: gen.TagStyle(""), expectedTag: "json:\"someSTRING\""},
 	}
 
 	for _, test := range tests {
@@ -127,7 +128,7 @@ func TestStruct_ConfigurableFieldTags(t *testing.T) {
 			for _, expected := range []string{
 				"package something",
 				"type Test struct {",
-				"SomeString string `avro:\"someString\" " + test.expectedTag + "`",
+				"SomeString string `avro:\"someSTRING\" " + test.expectedTag + "`",
 				"}",
 			} {
 				assert.Contains(t, lines, expected)