diff --git a/src/DataContainer/DcaFilterInterface.php b/src/DataContainer/DcaFilterInterface.php
deleted file mode 100644
index aec1ecde74..0000000000
--- a/src/DataContainer/DcaFilterInterface.php
+++ /dev/null
@@ -1,29 +0,0 @@
-<?php
-
-/*
- * This file is part of Contao.
- *
- * Copyright (c) 2005-2017 Leo Feyer
- *
- * @license LGPL-3.0+
- */
-
-namespace Contao\CoreBundle\DataContainer;
-
-/**
- * DCA filter interface.
- *
- * @author Leo Feyer <https://github.com/leofeyer>
- */
-interface DcaFilterInterface
-{
-    /**
-     * Returns the filter array.
-     *
-     * @return array
-     *
-     * @see DataContainer::setDcaFilter()
-     * @see DC_Folder::setDcaFilter()
-     */
-    public function getDcaFilter();
-}