diff --git a/manifest.json b/manifest.json
index bb698ed..463eb7d 100644
--- a/manifest.json
+++ b/manifest.json
@@ -2,7 +2,7 @@
 
   "manifest_version": 2,
   "name": "RSSPreview",
-  "version": "3.13",
+  "version": "3.13.1",
   "author": "Aurelien David",
   "homepage_url": "https://github.com/aureliendavid/rsspreview",
 
diff --git a/rsspreview.js b/rsspreview.js
index a30cf5b..35b146b 100644
--- a/rsspreview.js
+++ b/rsspreview.js
@@ -382,13 +382,13 @@
     // YouTube's canonical channel URLs look like /channel/AlphaNumericID
     // It also supports named channels of the form /c/MyChannelName
     // Match on both of these to autodetect channel feeds on either URL
-    let idPattern = /channel\/(?<channelId>[a-zA-Z0-9_-]+)/;
+    let idPattern = /channel\/([a-zA-Z0-9_-]+)/;
     let namePattern = /(?:c|user)\/[a-zA-Z0-9_-]+/;
     let urlPattern = new RegExp(`${idPattern.source}|${namePattern.source}`);
     if (document.URL.match(urlPattern)) {
       let feeds = {};
       let canonicalUrl = document.querySelector("link[rel='canonical']").href;
-      let channelId = canonicalUrl.match(idPattern).groups.channelId;
+      let channelId = canonicalUrl.match(idPattern)[1];
       let url = `https://www.youtube.com/feeds/videos.xml?channel_id=${channelId}`;
       let title = document.title;
       feeds[url] = title;