diff --git a/src/Latte/Runtime/TrustedString.php b/src/Latte/Runtime/TrustedString.php
new file mode 100644
index 000000000..4b4990632
--- /dev/null
+++ b/src/Latte/Runtime/TrustedString.php
@@ -0,0 +1,18 @@
+<?php
+
+/**
+ * This file is part of the Latte (https://latte.nette.org)
+ * Copyright (c) 2008 David Grudl (https://davidgrudl.com)
+ */
+
+declare(strict_types=1);
+
+namespace Latte\Runtime;
+
+
+interface TrustedString
+{
+	function __toString(): string;
+
+	function getType(): string;
+}