diff --git a/modules/backend/formwidgets/FileUpload.php b/modules/backend/formwidgets/FileUpload.php
index 22cca21c4..6d936db2b 100644
--- a/modules/backend/formwidgets/FileUpload.php
+++ b/modules/backend/formwidgets/FileUpload.php
@@ -9,6 +9,7 @@ use Backend\Classes\FormField;
 use Backend\Classes\FormWidgetBase;
 use ValidationException;
 use Exception;
+use Lang;
 
 /**
  * File upload field