Nginx unknown status variable

When upgrading from 3.4 to 3.5 (using the Ubuntu repository), We get this error in the log when trying to reload or restart nginx:

Reloading nginx configuration: nginx: [emerg] unknown "status" variable

Status is used in two places in /var/aegir/config/includes/nginx_vhost_common.conf

add_header X-Response-Status "$status";

and

fastcgi_cache_key "$is_bot$device$host$request_method$key_uri$cache_uid$http_x_forwarded_proto$sent_http_x_local_proto$cookie_respimg$status";

Commenting out the add_header line and removing $status from the 2nd line allows nginx to start.

Using nginx version 1.2.1