diff --git a/x-pack/plugins/index_lifecycle_management/server/routes/api/policies/register_create_route.ts b/x-pack/plugins/index_lifecycle_management/server/routes/api/policies/register_create_route.ts
index 65c37120e552f1..302b92a98407e2 100644
--- a/x-pack/plugins/index_lifecycle_management/server/routes/api/policies/register_create_route.ts
+++ b/x-pack/plugins/index_lifecycle_management/server/routes/api/policies/register_create_route.ts
@@ -33,6 +33,7 @@ async function createPolicy(
  */
 const bodySchema = schema.object({
   name: schema.string(),
+  deprecated: schema.maybe(schema.boolean()),
   phases: schema.object({
     hot: schema.any(),
     warm: schema.maybe(schema.any()),