diff --git a/core/modules/file/file.views.inc b/core/modules/file/file.views.inc
index c615c62..6b0fb59 100644
--- a/core/modules/file/file.views.inc
+++ b/core/modules/file/file.views.inc
@@ -110,6 +110,7 @@ function file_views_data() {
     'real field' => 'filename',
     'field' => array(
       'id' => 'file_extension',
+      'click sortable' => FALSE,
      ),
   );