diff --git a/dom/media/test/test_bug686942.html b/dom/media/test/test_bug686942.html
index b0ce722d3d9c..ee1eafbcf8d5 100644
--- a/dom/media/test/test_bug686942.html
+++ b/dom/media/test/test_bug686942.html
@@ -15,10 +15,6 @@ https://bugzilla.mozilla.org/show_bug.cgi?id=686942
 <pre id="test">
 <script class="testbody" type="text/javascript">
 
-if (navigator.platform.startsWith("Win")) {
-  SimpleTest.expectAssertions(0, 2);
-}
-
 var manager = new MediaTestManager;
 
 function onloaded(event) {
diff --git a/dom/media/test/test_seek_out_of_range.html b/dom/media/test/test_seek_out_of_range.html
index 2e0d2a8a0328..d7c1f76272e8 100644
--- a/dom/media/test/test_seek_out_of_range.html
+++ b/dom/media/test/test_seek_out_of_range.html
@@ -10,10 +10,6 @@
 <pre id="test">
 <script class="testbody" type="text/javascript">
 
-if (navigator.platform.startsWith("Win")) {
-  SimpleTest.expectAssertions(0, 10);
-}
-
 var manager = new MediaTestManager;
 
 // Test if the ended event works correctly.