diff --git a/src/CampaignAdminExtension.php b/src/CampaignAdminExtension.php
index 70ecbb5..7fa24f2 100644
--- a/src/CampaignAdminExtension.php
+++ b/src/CampaignAdminExtension.php
@@ -11,7 +11,7 @@
  */
 class CampaignAdminExtension extends Extension
 {
-    public function init()
+    protected function onInit()
     {
         Requirements::add_i18n_javascript('silverstripe/campaign-admin: client/lang', false);
         Requirements::javascript('silverstripe/campaign-admin: client/dist/js/bundle.js');