diff --git a/specification/security/authenticate/SecurityAuthenticateResponse.ts b/specification/security/authenticate/SecurityAuthenticateResponse.ts
index 8d4a29b122..b7b2104ab7 100644
--- a/specification/security/authenticate/SecurityAuthenticateResponse.ts
+++ b/specification/security/authenticate/SecurityAuthenticateResponse.ts
@@ -46,5 +46,5 @@ export class AuthenticateApiKey {
   id: Id
   name?: Name
   managed_by: ApiKeyManagedBy
-  internal: boolean
+  internal?: boolean
 }