diff --git a/src/servers/sapphire_lobby/GameConnection.h b/src/servers/sapphire_lobby/GameConnection.h
index ded6fb04..99313bb7 100644
--- a/src/servers/sapphire_lobby/GameConnection.h
+++ b/src/servers/sapphire_lobby/GameConnection.h
@@ -9,6 +9,7 @@
 #include <Util/LockedQueue.h>
 
 #include <asio.hpp>
+#include <map>
 #include "LobbyPacketContainer.h"
 
 #include "Forwards.h"