diff --git a/install/dist/lib/gentoo.lib.php b/install/dist/lib/gentoo.lib.php
index 1f0789d2295cfb07dc1e460292ebfd55dfe6947d..17e95eb11b715dce0c29d3806f5ecc9291f18e65 100644
--- a/install/dist/lib/gentoo.lib.php
+++ b/install/dist/lib/gentoo.lib.php
@@ -345,6 +345,7 @@ class installer extends installer_base
 		if(version_compare($dovecot_version,2, '>=')) {
 			$content = str_replace('# iterate_query', 'iterate_query', $content);
 		}
+		$content = str_replace('{server_id}', $conf['server_id'], $content);
 		$this->write_config_file($configfile, $content);
 	}