diff --git a/code/extensions/CMSMainEditFormExtension.php b/code/extensions/CMSMainEditFormExtension.php
index 9ed6777..17a083d 100644
--- a/code/extensions/CMSMainEditFormExtension.php
+++ b/code/extensions/CMSMainEditFormExtension.php
@@ -83,6 +83,6 @@ private function isAssetAdmin()
      */
     private function hasSecureAssets()
     {
-        return Object::has_extension('File', 'SecureFileExtension');
+        return DataObject::has_extension('File', 'SecureFileExtension');
     }
 }