diff --git a/logs/file.go b/logs/file.go
index f75e5bae..7798a221 100644
--- a/logs/file.go
+++ b/logs/file.go
@@ -55,7 +55,6 @@ type fileLogWriter struct {
 	Level int `json:"level"`
 
 	Perm string `json:"perm"`
-	perm os.FileMode
 
 	fileNameOnly, suffix string // like "project.log", project is fileNameOnly and .log is suffix
 }
@@ -68,7 +67,6 @@ func newFileWriter() Logger {
 		Rotate:  true,
 		Level:   LevelTrace,
 		Perm:    "0660",
-		perm:    0660,
 	}
 	return w
 }
@@ -82,7 +80,7 @@ func newFileWriter() Logger {
 //	"daily":true,
 //	"maxDays":15,
 //	"rotate":true,
-//  	"perm":0600
+//  	"perm":"0600"
 //	}
 func (w *fileLogWriter) Init(jsonConfig string) error {
 	err := json.Unmarshal([]byte(jsonConfig), w)
@@ -92,11 +90,6 @@ func (w *fileLogWriter) Init(jsonConfig string) error {
 	if len(w.Filename) == 0 {
 		return errors.New("jsonconfig must have filename")
 	}
-	perm, err := strconv.ParseInt(w.Perm, 8, 64)
-	if err != nil {
-		return err
-	}
-	w.perm = os.FileMode(perm)
 	w.suffix = filepath.Ext(w.Filename)
 	w.fileNameOnly = strings.TrimSuffix(w.Filename, w.suffix)
 	if w.suffix == "" {
@@ -161,7 +154,11 @@ func (w *fileLogWriter) WriteMsg(when time.Time, msg string, level int) error {
 
 func (w *fileLogWriter) createLogFile() (*os.File, error) {
 	// Open the log file
-	fd, err := os.OpenFile(w.Filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, w.perm)
+	perm, err := strconv.ParseInt(w.Perm, 8, 64)
+	if err != nil {
+		return nil, err
+	}
+	fd, err := os.OpenFile(w.Filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, os.FileMode(perm))
 	return fd, err
 }