diff --git a/js/media/StereoBalanceNode.js b/js/media/StereoBalanceNode.js
index 326cbed4..4cb2f60c 100644
--- a/js/media/StereoBalanceNode.js
+++ b/js/media/StereoBalanceNode.js
@@ -1,7 +1,7 @@
 // The Web Audio API does not offer an easy way to make a stereo balance
 // control. This is an attempt to fill that void, using an API similar to
 // [StereoPannerNode](https://developer.mozilla.org/en-US/docs/Web/API/StereoPannerNode)
-export default function StereoBalanceNode(context, options) {
+export default function StereoBalanceNode(context, options = { balance: 0 }) {
   let balance = 0;
 
   // ChannelSplitterNode cannot be told to use a `channelInterperatation` of