diff --git a/dlls/jscript/tests/api.js b/dlls/jscript/tests/api.js
index 1a81253a02a..d4aa7f43835 100644
--- a/dlls/jscript/tests/api.js
+++ b/dlls/jscript/tests/api.js
@@ -351,6 +351,12 @@ tmp = Object.prototype.toString.call(new VBArray(createArray()));
 ok(tmp === "[object Object]", "toString.call(new VBArray()) = " + tmp);
 (tmp = new Enumerator()).f = Object.prototype.toString;
 ok(tmp.f() === "[object Object]", "tmp.f() = " + tmp.f());
+tmp = Object.prototype.toString.call(null);
+ok(tmp === "[object Object]", "toString.call(null) = " + tmp);
+tmp = Object.prototype.toString.call(undefined);
+ok(tmp === "[object Object]", "toString.call(undefined) = " + tmp);
+tmp = Object.prototype.toString.call();
+ok(tmp === "[object Object]", "toString.call() = " + tmp);
 
 function TSTestConstr() {}
 TSTestConstr.prototype = { toString: function() { return "test"; } };
diff --git a/dlls/mshtml/tests/es5.js b/dlls/mshtml/tests/es5.js
index 7ee8cc1e03b..7a5b9d57eae 100644
--- a/dlls/mshtml/tests/es5.js
+++ b/dlls/mshtml/tests/es5.js
@@ -767,6 +767,28 @@ function test_getPrototypeOf() {
     next_test();
 }
 
+function test_toString() {
+    var tmp;
+
+    (function () { tmp = Object.prototype.toString.call(arguments); })();
+    todo_wine.
+    ok(tmp === "[object Arguments]", "toString.call(arguments) = " + tmp);
+    tmp = Object.prototype.toString.call(this);
+    todo_wine.
+    ok(tmp === "[object Window]", "toString.call(null) = " + tmp);
+    tmp = Object.prototype.toString.call(null);
+    todo_wine.
+    ok(tmp === "[object Null]", "toString.call(null) = " + tmp);
+    tmp = Object.prototype.toString.call(undefined);
+    todo_wine.
+    ok(tmp === "[object Undefined]", "toString.call(undefined) = " + tmp);
+    tmp = Object.prototype.toString.call();
+    todo_wine.
+    ok(tmp === "[object Undefined]", "toString.call() = " + tmp);
+
+    next_test();
+}
+
 function test_bind() {
     var f, r;
     var o = new Object(), o2 = new Object();
@@ -860,5 +882,6 @@ var tests = [
     test_global_properties,
     test_string_split,
     test_getPrototypeOf,
+    test_toString,
     test_bind
 ];