diff --git a/js/filefield_sources.js b/js/filefield_sources.js
index 1f66a37..10952a8 100644
--- a/js/filefield_sources.js
+++ b/js/filefield_sources.js
@@ -254,9 +254,4 @@ Drupal.fileFieldSources = {
   }
 };
 
-// Override triggerUploadButton method from file.js.
-Drupal.file.triggerUploadButton = function (event) {
-  $(event.target).closest('.form-managed-file').find('.form-submit.upload-button').trigger('mousedown');
-}
-
 })(jQuery, Drupal);