diff --git a/js/js.libraries/src/stdlib/testCode.kt b/js/js.libraries/src/stdlib/testCode.kt
index 3371d3af2d7..5309fc87507 100644
--- a/js/js.libraries/src/stdlib/testCode.kt
+++ b/js/js.libraries/src/stdlib/testCode.kt
@@ -25,6 +25,10 @@ public class QUnitAsserter(): Asserter {
         QUnit.ok(expected == actual, "$message. Expected <$expected> actual <$actual>")
     }
 
+    public override fun assertNotEquals(message: String, illegal: Any?, actual: Any?) {
+        QUnit.ok(illegal != actual, "$message. Illegal value: <$illegal>")
+    }
+
     public override fun assertNotNull(message: String, actual: Any?) {
         QUnit.ok(actual != null, message)
     }
diff --git a/js/js.translator/testData/jsTester/jsTester.kt b/js/js.translator/testData/jsTester/jsTester.kt
index c37afd6c39a..8a3d9e728bb 100644
--- a/js/js.translator/testData/jsTester/jsTester.kt
+++ b/js/js.translator/testData/jsTester/jsTester.kt
@@ -13,6 +13,9 @@ public class JsTestsAsserter() : Asserter {
     public override fun assertEquals(message: String, expected: Any?, actual: Any?) {
         assert(actual == expected, "$message. Expected <$expected> actual <$actual>")
     }
+    public override fun assertNotEquals(message: String, illegal: Any?, actual: Any?) {
+        assert(illegal != actual, "$message. Illegal value: <$illegal>")
+    }
     public override fun assertNotNull(message: String, actual: Any?) {
         assert(actual != null, message)
     }
diff --git a/libraries/kunit/src/main/kotlin/junit/JUnit.kt b/libraries/kunit/src/main/kotlin/junit/JUnit.kt
index ebd721e5447..6d34bdf8ec8 100644
--- a/libraries/kunit/src/main/kotlin/junit/JUnit.kt
+++ b/libraries/kunit/src/main/kotlin/junit/JUnit.kt
@@ -8,6 +8,10 @@ class JUnitAsserter : Asserter {
         Assert.assertEquals(message, expected, actual)
     }
 
+    override fun assertNotEquals(message : String, illegal : Any?, actual : Any?) {
+        Assert.assertNotEquals(message, illegal, actual)
+    }
+
     override fun assertNotNull(message : String, actual : Any?) {
         Assert.assertNotNull(message, actual)
     }
diff --git a/libraries/pom.xml b/libraries/pom.xml
index 2c64d020372..0b7f51e84e4 100644
--- a/libraries/pom.xml
+++ b/libraries/pom.xml
@@ -45,7 +45,7 @@
         <asm.version>3.3.1</asm.version>
         <dart.name>dart-r3300</dart.name>
         <guava.version>11.0.2</guava.version>
-        <junit-version>4.10</junit-version>
+        <junit-version>4.11</junit-version>
         <kotlin-maven-plugin.version>0.2.3.8</kotlin-maven-plugin.version>
         <kotlin-dist>${project-root}/dist</kotlin-dist>
         <kotlin-sdk>${kotlin-dist}/kotlinc</kotlin-sdk>
diff --git a/libraries/stdlib/src/kotlin/test/Test.kt b/libraries/stdlib/src/kotlin/test/Test.kt
index ea366d5e67b..71033424921 100644
--- a/libraries/stdlib/src/kotlin/test/Test.kt
+++ b/libraries/stdlib/src/kotlin/test/Test.kt
@@ -35,6 +35,11 @@ public fun assertEquals(expected: Any?, actual: Any?, message: String = "") {
     asserter.assertEquals(message, expected, actual)
 }
 
+/** Asserts that the actual value is not equal to the illegal value, with an optional message */
+public fun assertNotEquals(illegal: Any?, actual: Any?, message: String = "") {
+    asserter.assertNotEquals(message, illegal, actual)
+}
+
 /** Asserts that the expression is not null, with an optional message */
 public fun <T : Any> assertNotNull(actual: T?, message: String = ""): T {
     asserter.assertNotNull(message, actual)
@@ -91,6 +96,8 @@ public trait Asserter {
 
     public fun assertEquals(message: String, expected: Any?, actual: Any?): Unit
 
+    public fun assertNotEquals(message: String, illegal: Any?, actual: Any?): Unit
+
     public fun assertNotNull(message: String, actual: Any?): Unit
 
     public fun assertNull(message: String, actual: Any?): Unit
diff --git a/libraries/stdlib/src/kotlin/test/TestJVM.kt b/libraries/stdlib/src/kotlin/test/TestJVM.kt
index 3e05ff64670..9326b5aa208 100644
--- a/libraries/stdlib/src/kotlin/test/TestJVM.kt
+++ b/libraries/stdlib/src/kotlin/test/TestJVM.kt
@@ -67,6 +67,12 @@ private class DefaultAsserter() : Asserter {
         }
     }
 
+    override fun assertNotEquals(message : String, illegal: Any?, actual : Any?) {
+        if (illegal == actual) {
+            fail("$message. Illegal value: <$illegal>")
+        }
+    }
+
     public override fun assertNotNull(message : String, actual : Any?) {
         if (actual == null) {
             fail(message)