diff --git a/src/widgets/plex/proxy.js b/src/widgets/plex/proxy.js
index 53931aca..c092ebaa 100644
--- a/src/widgets/plex/proxy.js
+++ b/src/widgets/plex/proxy.js
@@ -111,7 +111,8 @@ export default async function plexProxyHandler(req, res) {
           : `/library/sections/${library._attributes.key}/albums`; // music
         [status, apiData] = await fetchFromPlexAPI(libraryURL, widget);
         if (apiData && apiData.MediaContainer) {
-          const size = parseInt(apiData.MediaContainer._attributes.size, 10);
+          const sizeProp = apiData.MediaContainer._attributes["totalSize"] ? "totalSize" : "size";
+          const size = parseInt(apiData.MediaContainer._attributes[sizeProp], 10);
           if (library._attributes.type === "movie") {
             movies += size;
           } else if (library._attributes.type === "show") {