diff --git a/charts/eck-resources/templates/agent-fleet-server.yaml b/charts/eck-resources/templates/agent-fleet-server.yaml
index 494e919..45dc056 100644
--- a/charts/eck-resources/templates/agent-fleet-server.yaml
+++ b/charts/eck-resources/templates/agent-fleet-server.yaml
@@ -6,6 +6,7 @@ metadata:
   namespace: {{ .Release.Namespace }}
 spec:
   version: 8.12.0
+  mode: fleet  # 💥 This is the key fix
   elasticsearchRefs:
     - name: elasticsearch-{{ .Values.env }}
   kibanaRef: