diff --git a/packages/interfaces/src/message.ts b/packages/interfaces/src/message.ts
index 1c8348239e..a98090220a 100644
--- a/packages/interfaces/src/message.ts
+++ b/packages/interfaces/src/message.ts
@@ -1,7 +1,7 @@
 import type { PubsubTopic } from "./misc.js";
 
 export interface SingleShardInfo {
-  clusterId: number;
+  clusterId?: number;
   /**
    * Specifying this field indicates to the encoder/decoder that static sharding must be used.
    */
diff --git a/packages/interfaces/src/protocols.ts b/packages/interfaces/src/protocols.ts
index c7c223c6b4..b21a5871b5 100644
--- a/packages/interfaces/src/protocols.ts
+++ b/packages/interfaces/src/protocols.ts
@@ -23,7 +23,7 @@ export interface IBaseProtocol {
 }
 
 export type ContentTopicInfo = {
-  clusterId: number;
+  clusterId?: number;
   contentTopics: string[];
 };