diff --git a/src/server/bnetserver/Server/Session.h b/src/server/bnetserver/Server/Session.h
index 126abf0f0f7..91890f9becb 100644
--- a/src/server/bnetserver/Server/Session.h
+++ b/src/server/bnetserver/Server/Session.h
@@ -22,10 +22,10 @@
 #include "BattlenetPacketCrypt.h"
 #include "Socket.h"
 #include "BigNumber.h"
+#include "Callback.h"
 #include <memory>
 #include <boost/asio/ip/tcp.hpp>
 
-class Field;
 struct Realm;
 using boost::asio::ip::tcp;