diff --git a/code/Controllers/CMSMain.php b/code/Controllers/CMSMain.php
index 18cb08e00f..3a763c3b24 100644
--- a/code/Controllers/CMSMain.php
+++ b/code/Controllers/CMSMain.php
@@ -72,6 +72,7 @@
 use SilverStripe\VersionedAdmin\Controllers\CMSPageHistoryViewerController;
 use SilverStripe\Model\ArrayData;
 use SilverStripe\View\Requirements;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * The main "content" area of the CMS.
diff --git a/code/Model/SiteTree.php b/code/Model/SiteTree.php
index e003165f6a..5ee6a6398e 100755
--- a/code/Model/SiteTree.php
+++ b/code/Model/SiteTree.php
@@ -78,6 +78,7 @@
 use SilverStripe\View\Parsers\URLSegmentFilter;
 use SilverStripe\View\Shortcodes\EmbedShortcodeProvider;
 use SilverStripe\View\SSViewer;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * Basic data-object representing all pages within the site tree. All page types that live within the hierarchy should