diff --git a/config_defaults_inc.php b/config_defaults_inc.php
index be17cd580d..f81e12123c 100644
--- a/config_defaults_inc.php
+++ b/config_defaults_inc.php
@@ -4449,6 +4449,7 @@
 	'show_version',
 	'stop_on_errors',
 	'string_cookie',
+	'subprojects_enabled',
 	'top_include_page',
 	'use_ldap_email',
 	'use_ldap_realname',