diff --git a/scripts/x-api.js b/scripts/x-api.js
index fae40eeb..c202227a 100644
--- a/scripts/x-api.js
+++ b/scripts/x-api.js
@@ -84,7 +84,7 @@ H5P.VideoXAPI = (function ($) {
       // Variables used in compiling xAPI results.
 
       var screenSize = screen.width + 'x' + screen.height;
-      var playbackSize = (width !== undefined && width !== '') ? width + 'x' + height : 'undetermined';
+      var playbackSize = (width !== undefined && width !== '') ? width + 'x' + height : undefined;
       var playbackRate = rate;
       var userAgent = navigator.userAgent;
       var isFullscreen = Document.fullscreenElement !== null || document.mozFullScreen || document.webkitIsFullScreen || false;
diff --git a/scripts/youtube.js b/scripts/youtube.js
index 854f1263..69930f5f 100644
--- a/scripts/youtube.js
+++ b/scripts/youtube.js
@@ -194,8 +194,9 @@ H5P.VideoYouTube = (function ($) {
      */
     var getWidthOrHeight = function (returnType) {
       var quality = self.getQuality();
-      var width = '';
-      var height = '';
+      var width;
+      var height;
+
       switch (quality) {
         case 'small':
           width = '320';