diff --git a/drivers/lenovonas_share/types.go b/drivers/lenovonas_share/types.go
index 77b966d3bee8..37ff14655249 100644
--- a/drivers/lenovonas_share/types.go
+++ b/drivers/lenovonas_share/types.go
@@ -47,7 +47,11 @@ func (f File) GetPath() string {
 }
 
 func (f File) GetSize() int64 {
-	return f.Size
+	if f.IsDir() {
+		return 0
+	} else {
+		return f.Size
+	}
 }
 
 func (f File) GetName() string {
@@ -70,10 +74,6 @@ func (f File) GetID() string {
 	return f.GetPath()
 }
 
-func (f File) Thumb() string {
-	return ""
-}
-
 type Files struct {
 	Data struct {
 		List    []File `json:"list"`