diff --git a/server/media/oss/oss.go b/server/media/oss/oss.go
index fb1dd27..88f5fab 100644
--- a/server/media/oss/oss.go
+++ b/server/media/oss/oss.go
@@ -236,7 +236,6 @@ func (oh *ossHandler) Headers(tenantID types.TenantID, method string, url *url.U
 	case http.MethodGet:
 		options := []aliyunoss.Option{
 			aliyunoss.ResponseCacheControl(oh.conf.CacheControl),
-			aliyunoss.ResponseContentType(fdef.MimeType),
 		}
 		if isAttachment, _ := strconv.ParseBool(url.Query().Get("asatt")); isAttachment {
 			options = append(options, aliyunoss.ResponseContentDisposition("attachment"))