diff --git a/services/univention-apache/conffiles/etc/apache2/ucs-sites.conf.d/ucs-sites.conf b/services/univention-apache/conffiles/etc/apache2/ucs-sites.conf.d/ucs-sites.conf
index 89e676c..6dab865 100644
--- a/services/univention-apache/conffiles/etc/apache2/ucs-sites.conf.d/ucs-sites.conf
+++ b/services/univention-apache/conffiles/etc/apache2/ucs-sites.conf.d/ucs-sites.conf
@@ -1,3 +1,4 @@
+@%@UCRWARNING=# @%@
 RewriteEngine on
 RewriteOptions Inherit
 ProxyPreserveHost on