diff --git a/x-pack/plugins/alerts/server/alert_type_registry.test.ts b/x-pack/plugins/alerts/server/alert_type_registry.test.ts
index 096d064685a920..c7403907137153 100644
--- a/x-pack/plugins/alerts/server/alert_type_registry.test.ts
+++ b/x-pack/plugins/alerts/server/alert_type_registry.test.ts
@@ -77,7 +77,7 @@ describe('register()', () => {
 
   test('throws if AlertType Id isnt a string', () => {
     const alertType = {
-      id: (123 as any) as string,
+      id: (123 as unknown) as string,
       name: 'Test',
       actionGroups: [
         {