diff --git a/src/server/bnetserver/Server/Session.h b/src/server/bnetserver/Server/Session.h
index 396fd619321..126abf0f0f7 100644
--- a/src/server/bnetserver/Server/Session.h
+++ b/src/server/bnetserver/Server/Session.h
@@ -25,6 +25,7 @@
 #include <memory>
 #include <boost/asio/ip/tcp.hpp>
 
+class Field;
 struct Realm;
 using boost::asio::ip::tcp;