diff --git a/inc/fields/filefield.class.php b/inc/fields/filefield.class.php
index 1d68dd68f..e3dd67d74 100644
--- a/inc/fields/filefield.class.php
+++ b/inc/fields/filefield.class.php
@@ -109,6 +109,10 @@ public static function getName() {
       return __('File');
    }
 
+   public function prepareQuestionInputForSave($input) {
+      return $input;
+   }
+
    public static function canRequire() {
       return true;
    }