diff --git a/lang/funcs/funcgen/config.go b/lang/funcs/funcgen/config.go
index f25164bd..fb078e39 100644
--- a/lang/funcs/funcgen/config.go
+++ b/lang/funcs/funcgen/config.go
@@ -35,7 +35,7 @@ type arg struct {
 	// Value is the value of the argument.
 	Value string `yaml:"value,omitempty"`
 	// Type is the type of the argument.
-	// Supported: bool, string, int, int64, float64.
+	// Supported: bool, string, int, int64, float64, []byte.
 	Type string `yaml:"type"`
 }
 
@@ -57,14 +57,14 @@ func (obj *arg) ToMcl() (string, error) {
 	switch obj.Type {
 	case "bool":
 		return fmt.Sprintf("%s%s", prefix, types.TypeBool.String()), nil
-	case "string":
+	case "string", "[]byte":
 		return fmt.Sprintf("%s%s", prefix, types.TypeStr.String()), nil
 	case "int", "int64":
 		return fmt.Sprintf("%s%s", prefix, types.TypeInt.String()), nil
 	case "float64":
 		return fmt.Sprintf("%s%s", prefix, types.TypeFloat.String()), nil
 	default:
-		return "", fmt.Errorf("cannot convert %v to mcl", obj)
+		return "", fmt.Errorf("cannot convert %v to mcl", obj.Type)
 	}
 }
 
@@ -73,7 +73,7 @@ func (obj *arg) ToGolang() (string, error) {
 	switch obj.Type {
 	case "bool":
 		return "Bool", nil
-	case "string":
+	case "string", "[]byte":
 		return "Str", nil
 	case "int", "int64":
 		return "Int", nil
@@ -89,7 +89,7 @@ func (obj *arg) ToTestInput() (string, error) {
 	switch obj.Type {
 	case "bool":
 		return fmt.Sprintf("&types.BoolValue{V: %s}", obj.Name), nil
-	case "string":
+	case "string", "[]byte":
 		return fmt.Sprintf("&types.StrValue{V: %s}", obj.Name), nil
 	case "int":
 		return fmt.Sprintf("&types.IntValue{V: %s}", obj.Name), nil
diff --git a/lang/funcs/funcgen/fixtures/func_base.tpl b/lang/funcs/funcgen/fixtures/func_base.tpl
index 51135acd..1f824e8c 100644
--- a/lang/funcs/funcgen/fixtures/func_base.tpl
+++ b/lang/funcs/funcgen/fixtures/func_base.tpl
@@ -45,6 +45,10 @@ func init() {
 		T: types.NewType("func(s float, i int, x int, j int, k int, b bool, t str) str"),
 		V: TestpkgWithInt,
 	})
+	simple.ModuleRegister("golang/testpkg", "super_byte", &types.FuncValue{
+		T: types.NewType("func(s str, t str) str"),
+		V: TestpkgSuperByte,
+	})
 
 }
 
@@ -81,3 +85,9 @@ func TestpkgWithInt(input []types.Value) (types.Value, error) {
 		V: testpkg.WithInt(input[0].Float(), int(input[1].Int()), input[2].Int(), int(input[3].Int()), int(input[4].Int()), input[5].Bool(), input[6].Str()),
 	}, nil
 }
+
+func TestpkgSuperByte(input []types.Value) (types.Value, error) {
+	return &types.StrValue{
+		V: string(testpkg.SuperByte([]byte(input[0].Str()), input[1].Str())),
+	}, nil
+}
diff --git a/lang/funcs/funcgen/fixtures/func_base.txt b/lang/funcs/funcgen/fixtures/func_base.txt
index 70b58dee..fd9f1f88 100644
--- a/lang/funcs/funcgen/fixtures/func_base.txt
+++ b/lang/funcs/funcgen/fixtures/func_base.txt
@@ -12,3 +12,4 @@ func WithErrorButNothingElse(s string) error
 func WithNothingElse(s string)
 func Nextafter32(x, y float32) (r float32)
 func WithInt(s float64, i int, x int64, j, k int, b bool, t string) string
+func SuperByte(s []byte, t string) []byte
diff --git a/lang/funcs/funcgen/fixtures/func_base.yaml b/lang/funcs/funcgen/fixtures/func_base.yaml
index d80616c7..79a6506b 100644
--- a/lang/funcs/funcgen/fixtures/func_base.yaml
+++ b/lang/funcs/funcgen/fixtures/func_base.yaml
@@ -40,3 +40,11 @@
   errorful: false
   args: [{name: s, type: float64}, {name: i, type: int}, {name: x, type: int64}, {name: j, type: int}, {name: k, type: int}, {name: b, type: bool}, {name: t, type: string}]
   return: [{type: string}]
+- mgmtPackage: golang/testpkg
+  mclName: super_byte
+  internalName: TestpkgSuperByte
+  golangPackage: *pkg
+  golangFunc: SuperByte
+  errorful: false
+  args: [{name: s, type: "[]byte"}, {name: t, type: string}]
+  return: [{type: "[]byte"}]
diff --git a/lang/funcs/funcgen/func.go b/lang/funcs/funcgen/func.go
index ca55d457..dd5dfbc1 100644
--- a/lang/funcs/funcgen/func.go
+++ b/lang/funcs/funcgen/func.go
@@ -109,8 +109,11 @@ func (obj *function) MakeGolangArgs() (string, error) {
 			return "", err
 		}
 		input := fmt.Sprintf("input[%d].%s()", i, gol)
-		if a.Type == "int" {
+		switch a.Type {
+		case "int":
 			input = fmt.Sprintf("int(%s)", input)
+		case "[]byte":
+			input = fmt.Sprintf("[]byte(%s)", input)
 		}
 		args = append(args, input)
 	}
@@ -152,6 +155,8 @@ func (obj *function) ConvertStart() string {
 	switch t {
 	case "int":
 		return "int64("
+	case "[]byte":
+		return "string("
 	default:
 		return ""
 	}
@@ -161,7 +166,7 @@ func (obj *function) ConvertStart() string {
 func (obj *function) ConvertStop() string {
 	t := obj.Return[0].Type
 	switch t {
-	case "int":
+	case "int", "[]byte":
 		return ")"
 	default:
 		return ""
diff --git a/lang/funcs/funcgen/pkg.go b/lang/funcs/funcgen/pkg.go
index 0a15199e..35b4215f 100644
--- a/lang/funcs/funcgen/pkg.go
+++ b/lang/funcs/funcgen/pkg.go
@@ -33,7 +33,7 @@ import (
 )
 
 var (
-	validSignature = regexp.MustCompile(`^func (?P<name>[A-Z][a-zA-Z0-9]+)\((?P<args>([a-zA-Z]+( (bool|string|int|int64|float64))?(, )?){0,})\) (?P<return>(bool|string|int|int64|float64|)|\((bool|string|int|int64|float64), error\))$`)
+	validSignature = regexp.MustCompile(`^func (?P<name>[A-Z][a-zA-Z0-9]+)\((?P<args>([a-zA-Z]+( (bool|string|int|int64|float64|\[\]byte))?(, )?){0,})\) (?P<return>(bool|string|int|int64|float64|\[\]byte|)|\((bool|string|int|int64|float64|\[\]byte), error\))$`)
 	errExcluded    = errors.New("function is excluded")
 )
 
@@ -205,7 +205,7 @@ func parseArgs(str string) []arg {
 
 func parseReturn(str string) []arg {
 	var returns []arg
-	re := regexp.MustCompile(`(bool|string|int|int64|float64)`)
+	re := regexp.MustCompile(`(bool|string|int|int64|float64|\[\]byte)`)
 	t := string(re.Find([]byte(str)))
 	returns = append(returns, arg{Type: t})
 	return returns