diff --git a/harness/propertyHelper.js b/harness/propertyHelper.js
index e2627877e4..8ce65ba86c 100644
--- a/harness/propertyHelper.js
+++ b/harness/propertyHelper.js
@@ -11,14 +11,8 @@ function isConfigurable(obj, name) {
 }
 
 function isEnumerable(obj, name) {
-    for (var prop in obj) {
-        if (Object.prototype.hasOwnProperty.call(obj, prop) && 
-            assert._isSameValue(prop, name)) {
-            return true;
-        }
-    }
-
-    return false;
+    return Object.prototype.hasOwnProperty.call(obj, name) &&
+        Object.prototype.propertyIsEnumerable.call(obj, name);
 }
 
 function isEqualTo(obj, name, expectedValue) {
diff --git a/test/harness/propertyhelper-verifyenumerable-enumerable-symbol.js b/test/harness/propertyhelper-verifyenumerable-enumerable-symbol.js
new file mode 100644
index 0000000000..e88dfec0c1
--- /dev/null
+++ b/test/harness/propertyhelper-verifyenumerable-enumerable-symbol.js
@@ -0,0 +1,17 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    Objects whose specified symbol property is enumerable satisfy the assertion.
+includes: [propertyHelper.js]
+features: [Symbol]
+---*/
+
+var obj = {};
+var s = Symbol('1');
+Object.defineProperty(obj, s, {
+  enumerable: true
+});
+
+verifyEnumerable(obj, s);
diff --git a/test/harness/propertyhelper-verifyenumerable-enumerable.js b/test/harness/propertyhelper-verifyenumerable-enumerable.js
index 7540999802..acaa0d8bc1 100644
--- a/test/harness/propertyhelper-verifyenumerable-enumerable.js
+++ b/test/harness/propertyhelper-verifyenumerable-enumerable.js
@@ -3,7 +3,7 @@
 
 /*---
 description: >
-    Objects whose specified property is enumerable satisfy the assertion.
+    Objects whose specified string property is enumerable satisfy the assertion.
 includes: [propertyHelper.js]
 ---*/
 
diff --git a/test/harness/propertyhelper-verifyenumerable-not-enumerable-symbol.js b/test/harness/propertyhelper-verifyenumerable-not-enumerable-symbol.js
new file mode 100644
index 0000000000..6968ca896d
--- /dev/null
+++ b/test/harness/propertyhelper-verifyenumerable-not-enumerable-symbol.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: |
+    Objects whose specified symbol property is not enumerable do not satisfy the
+    assertion.
+includes: [propertyHelper.js]
+features: [Symbol]
+---*/
+
+var threw = false;
+var obj = {};
+var s = Symbol('1');
+Object.defineProperty(obj, s, {
+  enumerable: false
+});
+
+try {
+  verifyEnumerable(obj, s);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    throw new Test262Error(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  throw new Test262Error(
+    'Expected a Test262Error, but no error was thrown for symbol key.'
+  );
+}
diff --git a/test/harness/propertyhelper-verifyenumerable-not-enumerable.js b/test/harness/propertyhelper-verifyenumerable-not-enumerable.js
index 569ac0904a..b6ff01410c 100644
--- a/test/harness/propertyhelper-verifyenumerable-not-enumerable.js
+++ b/test/harness/propertyhelper-verifyenumerable-not-enumerable.js
@@ -2,8 +2,8 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-description: >
-    Objects whose specified property is not enumerable do not satisfy the
+description: |
+    Objects whose specified string property is not enumerable do not satisfy the
     assertion.
 includes: [propertyHelper.js]
 ---*/
@@ -19,7 +19,7 @@ try {
 } catch(err) {
   threw = true;
   if (err.constructor !== Test262Error) {
-    $ERROR(
+    throw new Test262Error(
       'Expected a Test262Error, but a "' + err.constructor.name +
       '" was thrown.'
     );
@@ -27,5 +27,7 @@ try {
 }
 
 if (threw === false) {
-  $ERROR('Expected a Test262Error, but no error was thrown.');
+  throw new Test262Error(
+    'Expected a Test262Error, but no error was thrown for string key.'
+  );
 }
diff --git a/test/harness/propertyhelper-verifynotenumerable-enumerable-symbol.js b/test/harness/propertyhelper-verifynotenumerable-enumerable-symbol.js
new file mode 100644
index 0000000000..220c4f79c5
--- /dev/null
+++ b/test/harness/propertyhelper-verifynotenumerable-enumerable-symbol.js
@@ -0,0 +1,35 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: |
+    Objects whose specified symbol property is enumerable do not satisfy the
+    assertion.
+includes: [propertyHelper.js]
+features: [Symbol]
+---*/
+
+var threw = false;
+var obj = {};
+var s = Symbol('1');
+Object.defineProperty(obj, s, {
+  enumerable: true
+});
+
+try {
+  verifyNotEnumerable(obj, s);
+} catch(err) {
+  threw = true;
+  if (err.constructor !== Test262Error) {
+    throw new Test262Error(
+      'Expected a Test262Error, but a "' + err.constructor.name +
+      '" was thrown.'
+    );
+  }
+}
+
+if (threw === false) {
+  throw new Test262Error(
+    'Expected a Test262Error, but no error was thrown for symbol key.'
+  );
+}
diff --git a/test/harness/propertyhelper-verifynotenumerable-enumerable.js b/test/harness/propertyhelper-verifynotenumerable-enumerable.js
index 1d838d4f6c..5a9b136870 100644
--- a/test/harness/propertyhelper-verifynotenumerable-enumerable.js
+++ b/test/harness/propertyhelper-verifynotenumerable-enumerable.js
@@ -2,8 +2,8 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-description: >
-    Objects whose specified property is enumerable do not satisfy the
+description: |
+    Objects whose specified string property is enumerable do not satisfy the
     assertion.
 includes: [propertyHelper.js]
 ---*/
@@ -27,5 +27,7 @@ try {
 }
 
 if (threw === false) {
-  $ERROR('Expected a Test262Error, but no error was thrown.');
+  throw new Test262Error(
+    'Expected a Test262Error, but no error was thrown for string key.'
+  );
 }
diff --git a/test/harness/propertyhelper-verifynotenumerable-not-enumerable-symbol.js b/test/harness/propertyhelper-verifynotenumerable-not-enumerable-symbol.js
new file mode 100644
index 0000000000..5cc7d53c08
--- /dev/null
+++ b/test/harness/propertyhelper-verifynotenumerable-not-enumerable-symbol.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: |
+    Objects whose specified symbol property is not enumerable satisfy the
+    assertion.
+includes: [propertyHelper.js]
+features: [Symbol]
+---*/
+
+var obj = {};
+var s = Symbol('1');
+Object.defineProperty(obj, s, {
+  enumerable: false
+});
+
+verifyNotEnumerable(obj, s);
diff --git a/test/harness/propertyhelper-verifynotenumerable-not-enumerable.js b/test/harness/propertyhelper-verifynotenumerable-not-enumerable.js
index 6e04b69309..29c32fab69 100644
--- a/test/harness/propertyhelper-verifynotenumerable-not-enumerable.js
+++ b/test/harness/propertyhelper-verifynotenumerable-not-enumerable.js
@@ -2,8 +2,9 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-description: >
-    Objects whose specified property is not enumerable satisfy the assertion.
+description: |
+    Objects whose specified string property is not enumerable satisfy the
+    assertion.
 includes: [propertyHelper.js]
 ---*/