diff --git a/resources/file_resource.inc b/resources/file_resource.inc
index 2d6a33c..e16fff0 100644
--- a/resources/file_resource.inc
+++ b/resources/file_resource.inc
@@ -227,7 +227,7 @@ function _file_resource_create_raw() {
  * @return
  *   The file
  */
-function _file_resource_retrieve($fid, $include_file_contents, $get_image_style) {
+function _file_resource_retrieve($fid, $include_file_contents, $get_image_style = FALSE) {
   if ($file = file_load($fid)) {
     $filepath = $file->uri;