diff --git a/TCPServer.h b/TCPServer.h
index 407a310..62c77e9 100644
--- a/TCPServer.h
+++ b/TCPServer.h
@@ -53,7 +53,7 @@ public:
 
     void stop();
 
-    int nbClients() const;
+    [[nodiscard]] int nbClients() const;
 
     void checkIfAllClientsReady();