diff --git a/changedetectionio/processors/__init__.py b/changedetectionio/processors/__init__.py
index 0adc3b50..3ef718ff 100644
--- a/changedetectionio/processors/__init__.py
+++ b/changedetectionio/processors/__init__.py
@@ -75,12 +75,12 @@ class difference_detection_processor():
 
         proxy_url = None
         if preferred_proxy_id:
-            # Custom browser endpoints should not have a proxy added
-            if not preferred_proxy_id.startswith('ui-'):
+            # Custom browser endpoints should NOT have a proxy added
+            if not prefer_fetch_backend.startswith('extra_browser_'):
                 proxy_url = self.datastore.proxy_list.get(preferred_proxy_id).get('url')
                 logger.debug(f"Selected proxy key '{preferred_proxy_id}' as proxy URL '{proxy_url}' for {url}")
             else:
-                logger.debug(f"Skipping adding proxy data when custom Browser endpoint is specified.")
+                logger.debug(f"Skipping adding proxy data when custom Browser endpoint is specified. ")
 
         # Now call the fetcher (playwright/requests/etc) with arguments that only a fetcher would need.
         # When browser_connection_url is None, it method should default to working out whats the best defaults (os env vars etc)