diff --git a/src/interfaces/api/site.ts b/src/interfaces/api/site.ts
index 7f667ef..7b4b3d3 100644
--- a/src/interfaces/api/site.ts
+++ b/src/interfaces/api/site.ts
@@ -117,6 +117,6 @@ export interface SaveSiteConfig {
 
 export interface FederatedInstances {
   linked: string[];
-  allowed: string[];
-  blocked: string[];
+  allowed?: string[];
+  blocked?: string[];
 }