diff --git a/x-pack/legacy/plugins/actions/index.ts b/x-pack/legacy/plugins/actions/index.ts
index bb982dd59b5a6..0a9acc13c3ac0 100644
--- a/x-pack/legacy/plugins/actions/index.ts
+++ b/x-pack/legacy/plugins/actions/index.ts
@@ -27,12 +27,9 @@ export function actions(kibana: any) {
       return Joi.object()
         .keys({
           enabled: Joi.boolean().default(false),
-          whitelistedHosts: Joi.alternatives()
-            .try(
-              Joi.array()
-                .items(Joi.string().hostname())
-                .sparse(false)
-            )
+          whitelistedHosts: Joi.array()
+            .items(Joi.string().hostname())
+            .sparse(false)
             .default([]),
         })
         .default();