diff --git a/binding/form_mapping.go b/binding/form_mapping.go
index 80b1d15a..7d6075b4 100644
--- a/binding/form_mapping.go
+++ b/binding/form_mapping.go
@@ -146,6 +146,15 @@ func setByForm(value reflect.Value, field reflect.StructField, form map[string][
 		if !ok {
 			vs = []string{opt.defaultValue}
 		}
+
+		switch value.Interface().(type) {
+		case []byte:
+			if len(vs) > 0 {
+				value.Set(reflect.ValueOf([]byte(vs[0])))
+				return true, nil
+			}
+		}
+
 		return true, setSlice(vs, value, field)
 	case reflect.Array:
 		if !ok {
diff --git a/binding/multipart_form_mapping.go b/binding/multipart_form_mapping.go
index f85a1aa6..1b2ad001 100644
--- a/binding/multipart_form_mapping.go
+++ b/binding/multipart_form_mapping.go
@@ -6,6 +6,7 @@ package binding
 
 import (
 	"errors"
+	"io/ioutil"
 	"mime/multipart"
 	"net/http"
 	"reflect"
@@ -39,6 +40,22 @@ func setByMultipartFormFile(value reflect.Value, field reflect.StructField, file
 			return true, nil
 		}
 	case reflect.Slice:
+		switch value.Interface().(type) {
+		case []byte:
+			fd, err := files[0].Open()
+			if err != nil {
+				return false, err
+			}
+			defer fd.Close()
+			c, err := ioutil.ReadAll(fd)
+			if err != nil {
+				return false, err
+			}
+
+			value.Set(reflect.ValueOf(c))
+			return true, nil
+		}
+
 		slice := reflect.MakeSlice(value.Type(), len(files), len(files))
 		isSetted, err = setArrayOfMultipartFormFiles(slice, field, files)
 		if err != nil || !isSetted {