diff --git a/test/built-ins/Number/prototype/toFixed/return-type.js b/test/built-ins/Number/prototype/toFixed/return-type.js
new file mode 100644
index 0000000000000000000000000000000000000000..d89755ce50b121fe1fbfbe166f258a2e911fc123
--- /dev/null
+++ b/test/built-ins/Number/prototype/toFixed/return-type.js
@@ -0,0 +1,11 @@
+// Copyright (C) 2017 K. Adam White. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 20.1.3.3
+esid: sec-number.prototype.tofixed
+description: >
+  Number.prototype.toFixed returns a string value
+---*/
+
+assert.sameValue(typeof (123.456).toFixed(), "string");