diff --git a/dlls/mshtml/tests/jstest.html b/dlls/mshtml/tests/jstest.html
index 00dd35dbc6e..cce805032c0 100644
--- a/dlls/mshtml/tests/jstest.html
+++ b/dlls/mshtml/tests/jstest.html
@@ -362,7 +362,12 @@ function test_xhr() {
     ok(typeof(xhr) === "object", "typeof(xhr) = " + typeof(xhr));
 }
 
-function test_sendMessage() {
+function test_postMessage() {
+    if(!("postMessage" in window)) {
+        win_skip("postMessage not available");
+        return;
+    }
+
     var onmessage_called = false;
     window.onmessage = function() {
         onmessage_called = true;
@@ -397,7 +402,7 @@ function runTests() {
     test_language_attribute();
     test_text_node();
     test_xhr();
-    test_sendMessage();
+    test_postMessage();
 
     var r = window.execScript("globalVar = true;");
     ok(r === undefined, "execScript returned " + r);