diff --git a/lib/browser/lists.js b/lib/browser/lists.js
index 1e95ca80..d4b8627a 100644
--- a/lib/browser/lists.js
+++ b/lib/browser/lists.js
@@ -21,7 +21,11 @@
 import { objectTypes } from './constants';
 import { createList, createMethods } from './util';
 
-export class List {}
+export class List {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+}
 
 // Non-mutating methods:
 createMethods(List.prototype, objectTypes.LIST, [
diff --git a/lib/browser/results.js b/lib/browser/results.js
index 2cedcb97..dba15d08 100644
--- a/lib/browser/results.js
+++ b/lib/browser/results.js
@@ -21,7 +21,11 @@
 import { objectTypes } from './constants';
 import { createList, createMethods } from './util';
 
-export class Results {}
+export class Results {
+    constructor() {
+        throw new TypeError('Illegal constructor');
+    }
+}
 
 createMethods(Results.prototype, objectTypes.RESULTS, [
     'filtered',
diff --git a/tests/js/list-tests.js b/tests/js/list-tests.js
index 37f8f4a5..2441486d 100644
--- a/tests/js/list-tests.js
+++ b/tests/js/list-tests.js
@@ -31,6 +31,10 @@ module.exports = BaseTest.extend({
             var obj = realm.create('PersonList', {list: []});
             TestCase.assertTrue(obj.list instanceof Realm.List);
         });
+
+        TestCase.assertThrows(function() {
+            new Realm.List();
+        });
     },
 
     testListLength: function() {
diff --git a/tests/js/results-tests.js b/tests/js/results-tests.js
index 02a80448..571a5447 100644
--- a/tests/js/results-tests.js
+++ b/tests/js/results-tests.js
@@ -24,6 +24,17 @@ var TestCase = require('./asserts');
 var schemas = require('./schemas');
 
 module.exports = BaseTest.extend({
+    testResultsConstructor: function() {
+        var realm = new Realm({schema: [schemas.TestObject]});
+        var objects = realm.objects('TestObject');
+
+        TestCase.assertTrue(objects instanceof Realm.Results);
+
+        TestCase.assertThrows(function() {
+            new Realm.Results();
+        });
+    },
+
     testResultsLength: function() {
         var realm = new Realm({schema: [schemas.TestObject]});
         var objects = realm.objects('TestObject');
@@ -35,6 +46,7 @@ module.exports = BaseTest.extend({
         });
         TestCase.assertEqual(objects.length, 1);
     },
+
     testResultsSubscript: function() {
         var realm = new Realm({schema: [schemas.PersonObject]});
         realm.write(function() {
@@ -50,6 +62,7 @@ module.exports = BaseTest.extend({
         TestCase.assertTrue(Object.getPrototypeOf(people[0]) === schemas.PersonObject.prototype);
         TestCase.assertTrue(people[0] instanceof schemas.PersonObject);
     },
+
     testResultsReadonly: function() {
         var realm = new Realm({schema: [schemas.TestObject]});
         var objects = realm.objects('TestObject');
@@ -71,17 +84,20 @@ module.exports = BaseTest.extend({
             objects.length = 0;
         });
     },
+
     testResultsInvalidProperty: function() {
         var realm = new Realm({schema: [schemas.TestObject]});
         var objects = realm.objects('TestObject');
         TestCase.assertEqual(undefined, objects.ablasdf);
     },
+
     testResultsInvalidObjectType: function() {
         var realm = new Realm({schema: [schemas.TestObject]});
         TestCase.assertThrows(function() {
             var objects = realm.objects('NotTestObject');
         });
     },
+
     testResultsEnumerate: function() {
         var realm = new Realm({schema: [schemas.TestObject]});
         var objects = realm.objects('TestObject');
@@ -105,6 +121,7 @@ module.exports = BaseTest.extend({
         TestCase.assertEqual(count, 1);
         TestCase.assertEqual(keys.length, 1);
     },
+
     testResultsFiltered: function() {
         var realm = new Realm({schema: [schemas.PersonObject, schemas.DefaultValues, schemas.TestObject]});
         realm.write(function() {
@@ -149,6 +166,7 @@ module.exports = BaseTest.extend({
             realm.objects('PersonObject').filtered("invalidQuery");
         });
     },
+
     testResultsSorted: function() {
         var realm = new Realm({schema: [schemas.IntPrimary]});
         var objects = realm.objects('IntPrimaryObject');