diff --git a/features.txt b/features.txt
index 90f4c8e7a2..966affca14 100644
--- a/features.txt
+++ b/features.txt
@@ -97,6 +97,10 @@ Intl.Locale
 # https://github.com/tc39/proposal-intl-relative-time
 Intl.RelativeTimeFormat
 
+# Intl.Segmenter
+# https://github.com/tc39/proposal-intl-segmenter
+Intl.Segmenter
+
 # Global
 # https://github.com/tc39/proposal-global
 global
diff --git a/test/intl402/Segmenter/prototype/toStringTag/toString.js b/test/intl402/Segmenter/prototype/toStringTag/toString.js
new file mode 100644
index 0000000000..a86d9fad39
--- /dev/null
+++ b/test/intl402/Segmenter/prototype/toStringTag/toString.js
@@ -0,0 +1,16 @@
+// Copyright 2018 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.Segmenter.prototype-@@tostringtag
+description: >
+    Checks Object.prototype.toString with Intl.Segmenter objects.
+info: |
+    Intl.Segmenter.prototype[ @@toStringTag ]
+
+    The initial value of the @@toStringTag property is the string value "Intl.Segmenter".
+features: [Intl.Segmenter]
+---*/
+
+assert.sameValue(Object.prototype.toString.call(Intl.Segmenter.prototype), "[object Intl.Segmenter]");
+assert.sameValue(Object.prototype.toString.call(new Intl.Segmenter()), "[object Intl.Segmenter]");
diff --git a/test/intl402/Segmenter/prototype/toStringTag/toStringTag.js b/test/intl402/Segmenter/prototype/toStringTag/toStringTag.js
new file mode 100644
index 0000000000..ec1b084777
--- /dev/null
+++ b/test/intl402/Segmenter/prototype/toStringTag/toStringTag.js
@@ -0,0 +1,23 @@
+// Copyright 2018 Igalia, S.L. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.Segmenter.prototype-@@tostringtag
+description: >
+    Checks the @@toStringTag property of the Segmenter prototype object.
+info: |
+    Intl.Segmenter.prototype[ @@toStringTag ]
+
+    The initial value of the @@toStringTag property is the string value "Intl.Segmenter".
+
+    This property has the attributes { [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }.
+includes: [propertyHelper.js]
+features: [Intl.Segmenter, Symbol.toStringTag]
+---*/
+
+verifyProperty(Intl.Segmenter.prototype, Symbol.toStringTag, {
+  value: "Intl.Segmenter",
+  writable: false,
+  enumerable: false,
+  configurable: true,
+});