diff --git a/application/Building/BuildingController.php b/application/Building/BuildingController.php
index dc0660822..1999bb46e 100644
--- a/application/Building/BuildingController.php
+++ b/application/Building/BuildingController.php
@@ -1,5 +1,8 @@
 <?php
 
+use PhpOffice\PhpSpreadsheet\Spreadsheet;
+use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
+
 class BuildingController extends mfBaseController {
   
   protected function init() {