diff --git a/helm/observability-operator/values.yaml b/helm/observability-operator/values.yaml
index 123a6ef4..d3a8fa30 100644
--- a/helm/observability-operator/values.yaml
+++ b/helm/observability-operator/values.yaml
@@ -16,6 +16,7 @@ managementCluster:
   region: region
 
 alertmanager:
+  alertmanagerURL: ""
   grafanaAddress: ""
   proxyURL: ""
   slackAPIToken: ""