diff --git a/docker/nginx/nginx.conf b/docker/nginx/nginx.conf
index b07cddc5..98595ea1 100644
--- a/docker/nginx/nginx.conf
+++ b/docker/nginx/nginx.conf
@@ -39,7 +39,8 @@ http {
         '$status $body_bytes_sent "$http_referer" '
         '"$http_user_agent" $upstream_response_time '
         '$upstream_bytes_sent $upstream_bytes_received '
-        '"$upstream_http_content_type" "$upstream_cache_status"';
+        '"$upstream_http_content_type" "$upstream_cache_status" '
+        '"portal_domain"';
 
     access_log  logs/access.log  main;