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diff --git a/dom/tests/mochitest/geolocation/test_clearWatch_invalid.html b/dom/tests/mochitest/geolocation/test_clearWatch_invalid.html
new file mode 100644
index 0000000000..fe2007481e
--- /dev/null
+++ b/dom/tests/mochitest/geolocation/test_clearWatch_invalid.html
@@ -0,0 +1,47 @@
+ <!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=463039
+-->
+<head>
+  <title>Test for Bug 463039</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="geolocation_common.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=463039">Mozilla Bug 463039</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SimpleTest.waitForExplicitFinish();
+
+resume_geolocationProvider(function() {
+  force_prompt(true, test1);
+});
+
+function test1() {
+  navigator.geolocation.watchPosition(function(){});
+
+  // there are no watches, so this should always throw
+  for (x=-10; x<10; x++) {
+    navigator.geolocation.clearWatch(x);
+    ok(1, "clearWatch should not throw");
+  }
+
+  // lets try something huge
+  navigator.geolocation.clearWatch(Number.MAX_VALUE);
+  ok(1, "clearWatch should not throw");
+
+  SimpleTest.finish();
+}
+    
+</script>
+</pre>
+</body>
+</html>
+