diff --git a/admin/settings/development.php b/admin/settings/development.php
index e55e1f28f00..5c41b86340b 100644
--- a/admin/settings/development.php
+++ b/admin/settings/development.php
@@ -14,6 +14,7 @@ if ($hassiteconfig) { // speedup for non-admins, add all caps used on this page
     $temp->add(new admin_setting_configcheckbox('enablegroupmembersonly', new lang_string('enablegroupmembersonly', 'admin'), new lang_string('configenablegroupmembersonly', 'admin'), 0));
 
     $temp->add(new admin_setting_configcheckbox('dndallowtextandlinks', new lang_string('dndallowtextandlinks', 'admin'), new lang_string('configdndallowtextandlinks', 'admin'), 0));
+    $temp->add(new admin_setting_configcheckbox('enablecssoptimiser', new lang_string('enablecssoptimiser','admin'), new lang_string('enablecssoptimiser_desc','admin'), 0));
 
     $ADMIN->add('experimental', $temp);
 
diff --git a/admin/settings/subsystems.php b/admin/settings/subsystems.php
index 7c70af3bf18..0e629b805c0 100644
--- a/admin/settings/subsystems.php
+++ b/admin/settings/subsystems.php
@@ -45,6 +45,4 @@ if ($hassiteconfig) { // speedup for non-admins, add all caps used on this page
     $checkbox->set_affects_modinfo(true);
 
     $optionalsubsystems->add(new admin_setting_configcheckbox('enableplagiarism', new lang_string('enableplagiarism','plagiarism'), new lang_string('configenableplagiarism','plagiarism'), 0));
-
-    $optionalsubsystems->add(new admin_setting_configcheckbox('enablecssoptimiser', new lang_string('enablecssoptimiser','admin'), new lang_string('enablecssoptimiser_desc','admin'), 0));
 }