diff --git a/src/Admin/SubsiteAdmin.php b/src/Admin/SubsiteAdmin.php
index 6c1c4c8f..4e345c4e 100644
--- a/src/Admin/SubsiteAdmin.php
+++ b/src/Admin/SubsiteAdmin.php
@@ -40,7 +40,7 @@ public function getEditForm($id = null, $fields = null)
         $form = parent::getEditForm($id, $fields);
 
         if ($this->modelClass === Subsite::class) {
-            $grid = $form->Fields()->dataFieldByName(str_replace('\\', '-', Subsite::class));
+            $grid = $form->Fields()->dataFieldByName($this->sanitiseClassName(Subsite::class));
             if ($grid) {
                 $grid->getConfig()->getComponentByType(GridFieldPaginator::class)->setItemsPerPage(100);
                 $grid->getConfig()->removeComponentsByType(GridFieldDetailForm::class);