diff --git a/lib/private/Group/Group.php b/lib/private/Group/Group.php
index bb85445f54..69dce21569 100644
--- a/lib/private/Group/Group.php
+++ b/lib/private/Group/Group.php
@@ -31,6 +31,9 @@ namespace OC\Group;
 use OCP\IGroup;
 
 class Group implements IGroup {
+	/** @var null|string  */
+	protected $displayName;
+
 	/**
 	 * @var string $id
 	 */