diff --git a/src/components/structures/UserSettings.js b/src/components/structures/UserSettings.js
index 389f08fd3b..7300d82541 100644
--- a/src/components/structures/UserSettings.js
+++ b/src/components/structures/UserSettings.js
@@ -958,7 +958,7 @@ module.exports = React.createClass({
 
         const audioInputs = this.state.mediaDevices.audioinput.slice(0);
         if (audioInputs.length > 0) {
-            let defaultInput;
+            let defaultInput = '';
             if (!audioInputs.some((input) => input.deviceId === 'default')) {
                 audioInputs.unshift(defaultOption);
             } else {
@@ -978,7 +978,7 @@ module.exports = React.createClass({
 
         const videoInputs = this.state.mediaDevices.videoinput.slice(0);
         if (videoInputs.length > 0) {
-            let defaultInput;
+            let defaultInput = '';
             if (!videoInputs.some((input) => input.deviceId === 'default')) {
                 videoInputs.unshift(defaultOption);
             } else {