diff --git a/frontend/src/app/pages/altitude/chat/service/chat.service.ts b/frontend/src/app/pages/altitude/chat/service/chat.service.ts
index ff323d3..c14ae6f 100644
--- a/frontend/src/app/pages/altitude/chat/service/chat.service.ts
+++ b/frontend/src/app/pages/altitude/chat/service/chat.service.ts
@@ -86,7 +86,13 @@ export class ChatService implements OnDestroy {
 
   public selectServer(server: string) {
     this._selectedServer.set(server);
-    this._servers.update((old) => old.map((s) => ({...s, unreadMessages: 0})));
+    this._servers.update((old) =>
+      old.map((chatServer) =>
+        chatServer.server === server
+          ? {...chatServer, unreadMessages: 0}
+          : chatServer
+      )
+    );
   }
 
 // single, deliberate escape hatch from the broken DOM/polyfill type overlap —