diff --git a/src/Bundle/Resources/config/listeners.yml b/src/Bundle/Resources/config/listeners.yml
index 3183723..4f4938d 100644
--- a/src/Bundle/Resources/config/listeners.yml
+++ b/src/Bundle/Resources/config/listeners.yml
@@ -98,6 +98,7 @@ services:
   netzmacht.contao_leaflet.listeners.register_libraries:
     class: Netzmacht\Contao\Leaflet\Listener\RegisterLibrariesListener
     arguments:
-     - '@netzmacht.contao_leaflet.libraries'
-     - '@netzmacht.contao_leaflet.definition.builder'
-
+      - '@netzmacht.contao_leaflet.libraries'
+      - '@netzmacht.contao_leaflet.definition.builder'
+    tags:
+      - { name: 'contao.hook', hook: 'initializeSystem', method: 'onInitializeSystem' }
diff --git a/src/Bundle/Resources/contao/config/config.php b/src/Bundle/Resources/contao/config/config.php
index 094c43f..29595b8 100644
--- a/src/Bundle/Resources/contao/config/config.php
+++ b/src/Bundle/Resources/contao/config/config.php
@@ -65,12 +65,3 @@ $GLOBALS['TL_MODELS']['tl_leaflet_marker']  = \Netzmacht\Contao\Leaflet\Model\Ma
 $GLOBALS['TL_MODELS']['tl_leaflet_popup']   = \Netzmacht\Contao\Leaflet\Model\PopupModel::class;
 $GLOBALS['TL_MODELS']['tl_leaflet_style']   = \Netzmacht\Contao\Leaflet\Model\StyleModel::class;
 $GLOBALS['TL_MODELS']['tl_leaflet_vector']  = \Netzmacht\Contao\Leaflet\Model\VectorModel::class;
-
-/*
- * Hooks.
- */
-
-$GLOBALS['TL_HOOKS']['initializeSystem'][] = [
-    'netzmacht.contao_leaflet.listeners.register_libraries',
-    'onInitializeSystem',
-];