diff --git a/conf/nginx.conf b/conf/nginx.conf
index 0099274e..49fe8655 100644
--- a/conf/nginx.conf
+++ b/conf/nginx.conf
@@ -62,6 +62,7 @@ server {
 	location /autodiscover/autodiscover.xml {
 		include fastcgi_params;
 		fastcgi_param SCRIPT_FILENAME /usr/local/bin/mailinabox-exchange-autodiscover.php;
+		fastcgi_param PHP_VALUE "short_open_tag=Off";
 		fastcgi_pass php-fpm;
 	}