diff --git a/routers/repo/attachment.go b/routers/repo/attachment.go
index a9b29368f..da429e06f 100644
--- a/routers/repo/attachment.go
+++ b/routers/repo/attachment.go
@@ -59,7 +59,7 @@ func UploadAttachment(ctx *context.Context) {
 	datasetID, _ := strconv.ParseInt(ctx.Req.FormValue("dataset_id"), 10, 64)
 
 	attach, err := models.NewAttachment(&models.Attachment{
-		IsPrivate:  false,
+		IsPrivate:  true,
 		UploaderID: ctx.User.ID,
 		Name:       header.Filename,
 		DatasetID:  datasetID,