diff --git a/util.go b/util.go
index bd601bb..f509f65 100644
--- a/util.go
+++ b/util.go
@@ -159,7 +159,6 @@ func getPrefixForStruct(prefixes []string, fieldStruct *reflect.StructField) []s
 }
 
 func marshalFile(target interface{}, file string, overWrite bool) error {
-	var f *os.File
 	var err error
 
 	var b []byte
@@ -171,21 +170,9 @@ func marshalFile(target interface{}, file string, overWrite bool) error {
 		if !overWrite {
 			return fmt.Errorf("Config: File[%s] is exist", file)
 		}
-		if f, err = os.OpenFile(file, os.O_WRONLY, os.ModeAppend); nil != err {
-			return err
-		}
-	} else {
-		if f, err = os.Create(file); nil != err {
-			return err
-		}
 	}
-	defer f.Close()
-
-	if _, err = f.Write(b); nil != err {
-		return err
-	}
-	return nil
 
+	return ioutil.WriteFile(file, b, os.ModeAppend)
 }
 
 func marshal(target interface{}, ext string) ([]byte, error) {