diff --git a/Apache/SOGo.conf b/Apache/SOGo.conf
index 737141775..a4c90c87d 100644
--- a/Apache/SOGo.conf
+++ b/Apache/SOGo.conf
@@ -69,6 +69,8 @@ ProxyPass /SOGo http://127.0.0.1:20000/SOGo retry=0
 
 <Proxy http://127.0.0.1:20000/SOGo>
 ## adjust the following to your configuration
+## and do not forget to enable the headers module
+<IfModule headers_module>
   RequestHeader set "x-webobjects-server-port" "443"
 #  RequestHeader set "x-webobjects-server-name" "yourhostname"
 #  RequestHeader set "x-webobjects-server-url" "https://yourhostname"
@@ -79,6 +81,7 @@ ProxyPass /SOGo http://127.0.0.1:20000/SOGo retry=0
 #  RequestHeader set "x-webobjects-remote-user" "%{REMOTE_USER}e" env=REMOTE_USER
 
   RequestHeader set "x-webobjects-server-protocol" "HTTP/1.0"
+</IfModule>
 
   AddDefaultCharset UTF-8