diff --git a/content/media/webaudio/test/Makefile.in b/content/media/webaudio/test/Makefile.in
index 0e913db8bb1f..c1e0993612c1 100644
--- a/content/media/webaudio/test/Makefile.in
+++ b/content/media/webaudio/test/Makefile.in
@@ -17,6 +17,7 @@ MOCHITEST_FILES := \
   test_bug839753.html \
   test_bug845960.html \
   test_bug856771.html \
+  test_bug866570.html \
   test_bug866737.html \
   test_analyserNode.html \
   test_AudioBuffer.html \
diff --git a/content/media/webaudio/test/test_bug866570.html b/content/media/webaudio/test/test_bug866570.html
new file mode 100644
index 000000000000..8e0899afc0c5
--- /dev/null
+++ b/content/media/webaudio/test/test_bug866570.html
@@ -0,0 +1,20 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Crashtest for bug 859600</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+SpecialPowers.setBoolPref("media.webaudio.enabled", true);
+AudioContext().foo = null;
+ok(true, "The test should not fatally assert");
+SpecialPowers.clearUserPref("media.webaudio.enabled");
+
+</script>
+</pre>
+</body>
+</html>
