diff --git a/.upgrade.yml b/.upgrade.yml
index f592cfa..1e7cd20 100644
--- a/.upgrade.yml
+++ b/.upgrade.yml
@@ -11,7 +11,7 @@ mappings:
   SiteTreeSubsites: SilverStripe\Subsites\Extensions\SiteTreeSubsites
   SubsiteMenuExtension: SilverStripe\Subsites\Extensions\SubsiteMenuExtension
   GridFieldSubsiteDetailForm: SilverStripe\Subsites\Forms\GridFieldSubsiteDetailForm
-  GridFieldSubsiteDetailForm_ItemRequest: SilverStripe\Subsites\Forms\GridFieldSubsiteDetailForm_ItemRequest
+  GridFieldSubsiteDetailForm_ItemRequest: SilverStripe\Subsites\Forms\GridFieldSubsiteDetailFormItemRequest
   SubsitesTreeDropdownField: SilverStripe\Subsites\Forms\SubsitesTreeDropdownField
   Subsite: SilverStripe\Subsites\Model\Subsite
   SubsiteDomain: SilverStripe\Subsites\Model\SubsiteDomain