diff --git a/xmlsitemap.module b/xmlsitemap.module
old mode 100644
new mode 100755
index 6f031be..ae4f8d1
--- a/xmlsitemap.module
+++ b/xmlsitemap.module
@@ -2200,7 +2200,7 @@
     'Cache-Control' => 'must-revalidate',
     'X-Robots-Tag' => 'noindex, follow',
   );
-  $response = xmlsitemap_file_transfer($response, $file, $headers);
+  $response = _xmlsitemap_file_transfer($response, $file, $headers);
   return $response;
 }
 
@@ -2220,7 +2220,7 @@
  * @return \Symfony\Component\HttpFoundation\Response
  *   Updated response.
  */
-function xmlsitemap_file_transfer(Response $response, $uri, $headers) {
+function _xmlsitemap_file_transfer(Response $response, $uri, $headers) {
   if (ob_get_level()) {
     ob_end_clean();
   }