diff --git a/rulebooks/alertmanager_listener.yml b/rulebooks/alertmanager_listener.yml
index 7ce1772..b61fa33 100644
--- a/rulebooks/alertmanager_listener.yml
+++ b/rulebooks/alertmanager_listener.yml
@@ -8,7 +8,7 @@
         host: 0.0.0.0
       filters:
         - eda.builtin.event_splitter:
-          splitter_key: payload.alerts
+            splitter_key: payload.alerts
   rules:
     - name: Resolve Disk Usage
       condition: