```
diff --git a/src/invidious.cr b/src/invidious.cr
index a9a3a96..9e31d74 100644
--- a/src/invidious.cr
+++ b/src/invidious.cr
@@ -1482,7 +1482,7 @@ get "/subscription_manager" do |env|
                 if format == "newpipe"
                   xmlUrl = "https://www.youtube.com/feeds/videos.xml?channel_id=#{channel.id}"
                 else
-                  xmlUrl = "#{HOST_URL}/feed/channel/#{channel.id}"
+                  xmlUrl = "#{env.request.host}/feed/channel/#{channel.id}"
                 end
 
                 xml.element("outline", text: channel.author, title: channel.author,
```