diff --git a/x-pack/plugins/alerting/common/index.ts b/x-pack/plugins/alerting/common/index.ts
index 1fa0806effdef..d71b69bcb51e7 100644
--- a/x-pack/plugins/alerting/common/index.ts
+++ b/x-pack/plugins/alerting/common/index.ts
@@ -66,4 +66,4 @@ export const INTERNAL_ALERTING_API_GET_ACTIVE_MAINTENANCE_WINDOWS_PATH =
 
 export const ALERTS_FEATURE_ID = 'alerts';
 export const MONITORING_HISTORY_LIMIT = 200;
-export const ENABLE_MAINTENANCE_WINDOWS = false;
+export const ENABLE_MAINTENANCE_WINDOWS = true;