diff --git a/argocd/apps/outline/outline.yaml b/argocd/apps/outline/outline.yaml
index c978678..2c18c87 100644
--- a/argocd/apps/outline/outline.yaml
+++ b/argocd/apps/outline/outline.yaml
@@ -15,7 +15,7 @@ spec:
           value: 'true'
         - name: 'endpoint'
           value: 'outline.innovation-hub-niedersachsen.de'
-        - name: ingress.hosts
+        - name: ingress.hosts[host]
           value: 'outline.innovation-hub-niedersachsen.de'
         - name: 'ingress.tls[0].hosts[0]'
           value: 'outline.innovation-hub-niedersachsen.de'