diff --git a/content/media/webaudio/test/mochitest.ini b/content/media/webaudio/test/mochitest.ini
index 08032601668..ac748a6fe31 100644
--- a/content/media/webaudio/test/mochitest.ini
+++ b/content/media/webaudio/test/mochitest.ini
@@ -110,6 +110,7 @@ support-files =
 [test_scriptProcessorNodeChannelCount.html]
 [test_scriptProcessorNodeZeroInputOutput.html]
 [test_scriptProcessorNodeNotConnected.html]
+[test_stereoPanningWithGain.html]
 [test_singleSourceDest.html]
 [test_waveShaper.html]
 [test_waveShaperNoCurve.html]
diff --git a/content/media/webaudio/test/test_stereoPanningWithGain.html b/content/media/webaudio/test/test_stereoPanningWithGain.html
new file mode 100644
index 00000000000..1ef0c037dfd
--- /dev/null
+++ b/content/media/webaudio/test/test_stereoPanningWithGain.html
@@ -0,0 +1,49 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test stereo equalpower panning with a GainNode</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 src="webaudio.js" type="text/javascript"></script>
+<script class="testbody" type="text/javascript">
+
+const size = 256;
+
+var gTest = {
+  numberOfChannels: 2,
+  createGraph: function(context) {
+    var panner = context.createPanner();
+    panner.setPosition(1.0, 0.0, 0.0); // reference distance the right
+    panner.panningModel = "equalpower";
+
+    var gain = context.createGain();
+    gain.gain.value = -0.5;
+    gain.connect(panner);
+
+    var buffer = context.createBuffer(2, 2, context.sampleRate);
+    buffer.getChannelData(0)[0] = 1.0;
+    buffer.getChannelData(1)[1] = 1.0;
+    var source = context.createBufferSource();
+    source.buffer = buffer;
+    source.connect(gain);
+    source.start(0);
+
+    return panner;
+  },
+  createExpectedBuffers: function(context) {
+    var expectedBuffer = context.createBuffer(2, size, context.sampleRate);
+    expectedBuffer.getChannelData(1)[0] = -0.5;
+    expectedBuffer.getChannelData(1)[1] = -0.5;
+    return expectedBuffer;
+  },
+};
+
+runTest();
+
+</script>
+</pre>
+</body>
+</html>
