diff --git a/packages/message-manager/src/AbstractMessageManager.ts b/packages/message-manager/src/AbstractMessageManager.ts
index 8aede188b3..9582e87a8b 100644
--- a/packages/message-manager/src/AbstractMessageManager.ts
+++ b/packages/message-manager/src/AbstractMessageManager.ts
@@ -204,7 +204,7 @@ export abstract class AbstractMessageManager<
   /**
    * EventEmitter instance used to listen to specific message events
    */
-  hub = new EventEmitter();
+  hub: EventEmitter = new EventEmitter();
 
   /**
    * Name of this controller used during composition