diff --git a/js/js.libraries/src/js/polyfills.js b/js/js.libraries/src/js/polyfills.js
index 60e8593cc2e..47ee982a247 100644
--- a/js/js.libraries/src/js/polyfills.js
+++ b/js/js.libraries/src/js/polyfills.js
@@ -31,3 +31,9 @@ if (typeof String.prototype.endsWith === "undefined") {
         return lastIndex !== -1 && lastIndex === position;
     };
 }
+// For HtmlUnit and PhantomJs
+if (typeof ArrayBuffer.isView === "undefined") {
+    ArrayBuffer.isView = function(a) {
+        return a != null && a.__proto__ != null && a.__proto__.__proto__ === Int8Array.prototype.__proto__;
+    };
+}
\ No newline at end of file
diff --git a/libraries/tools/kotlin-js-tests/src/test/web/index.html b/libraries/tools/kotlin-js-tests/src/test/web/index.html
index c56f59c7193..1bc0bf976b6 100644
--- a/libraries/tools/kotlin-js-tests/src/test/web/index.html
+++ b/libraries/tools/kotlin-js-tests/src/test/web/index.html
@@ -10,13 +10,6 @@
     <script src="../../../target/js/lib/kotlin.js"></script>
     <script src="../../../target/js/lib/kotlin-test-js.js"></script>
     <script src="../../../target/js/kotlin-js-tests.js"></script>
-    <script> // Polyfill for a missing HtmlUnit method
-        if (!ArrayBuffer.isView) {
-            ArrayBuffer.isView = function () {
-                return false;
-            }
-        }
-    </script>
 
     <script src="deepEqual.js"></script>
     <script src="swarminject.js"></script>