diff --git a/src/server.cpp b/src/server.cpp
index 148dce2..5bf4403 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -134,6 +134,7 @@ void Server::clientConnected()
                                                     // tsuserver4. It should disable fantacrypt
                                                     // completely in any client 2.4.3 or newer
     client->sendPacket(decryptor);
+    client->calculateIpid();
 #ifdef NET_DEBUG
     qDebug() << client->remote_ip.toString() << "connected";
 #endif