diff --git a/accessible/tests/mochitest/states/test_tree.xul b/accessible/tests/mochitest/states/test_tree.xul
index b1451929e17..c22af8e599a 100644
--- a/accessible/tests/mochitest/states/test_tree.xul
+++ b/accessible/tests/mochitest/states/test_tree.xul
@@ -95,9 +95,10 @@
       gQueue.invoke(); // Will call SimpleTest.finish();
     }
 
-    if (MAC) {
+    if (MAC && (navigator.userAgent.indexOf("Mac OS X 10.6") != -1)) {
+
       todo(false,
-           "Re-enable on Mac after fixing bug 845095 - intermittent orange");
+           "Re-enable on Mac OS 10.6 after fixing bug 845095 - intermittent orange");
       SimpleTest.finish();
     } else {
     SimpleTest.waitForExplicitFinish();