diff --git a/lib/util/platform.js b/lib/util/platform.js
index d9bc9de3e2..b8be771659 100644
--- a/lib/util/platform.js
+++ b/lib/util/platform.js
@@ -684,8 +684,8 @@ shaka.util.Platform = class {
         /** @type {{screenWidth: number, screenHeight: number}} */(
             JSON.parse(window.PalmSystem.deviceInfo));
         // WebOS has always been able to do 1080p.  Assume a 1080p limit.
-        maxResolution.width = Math.max(1920, deviceInfo.screenWidth);
-        maxResolution.height = Math.max(1080, deviceInfo.screenHeight);
+        maxResolution.width = Math.max(1920, deviceInfo['screenWidth']);
+        maxResolution.height = Math.max(1080, deviceInfo['screenHeight']);
       } catch (e) {
         shaka.log.alwaysWarn('WebOS: Error detecting screen size, default ' +
             'screen size 1920x1080.');