diff --git a/coolwsd.xml.in b/coolwsd.xml.in
index 2fc2a982d..7cdd425f6 100644
--- a/coolwsd.xml.in
+++ b/coolwsd.xml.in
@@ -37,7 +37,7 @@
     <sys_template_path desc="Path to a template tree with shared libraries etc to be used as source for chroot jails for child processes." type="path" relative="true" default="systemplate"></sys_template_path>
     <child_root_path desc="Path to the directory under which the chroot jails for the child processes will be created. Should be on the same file system as systemplate and lotemplate. Must be an empty directory." type="path" relative="true" default="jails"></child_root_path>
     <mount_jail_tree desc="Controls whether the systemplate and lotemplate contents are mounted or not, which is much faster than the default of linking/copying each file." type="bool" default="true"></mount_jail_tree>
-    <mount_namespaces desc="Use mount namespaces instead of coolmount." type="bool" default="false"></mount_namespaces>
+    <mount_namespaces desc="Use mount namespaces instead of coolmount." type="bool" default="@ENABLE_EXPERIMENTAL@"></mount_namespaces>
 
     <server_name desc="External hostname:port of the server running coolwsd. If empty, it's derived from the request (please set it if this doesn't work). May be specified when behind a reverse-proxy or when the hostname is not reachable directly." type="string" default=""></server_name>
     <file_server_root_path desc="Path to the directory that should be considered root for the file server. This should be the directory containing cool." type="path" relative="true" default="browser/../"></file_server_root_path>