diff --git a/GeneralsMD/Code/GameEngine/Include/GameNetwork/GeneralsOnline/OnlineServices_LobbyInterface.h b/GeneralsMD/Code/GameEngine/Include/GameNetwork/GeneralsOnline/OnlineServices_LobbyInterface.h
index 1e525e58e1f..b3455acf03c 100644
--- a/GeneralsMD/Code/GameEngine/Include/GameNetwork/GeneralsOnline/OnlineServices_LobbyInterface.h
+++ b/GeneralsMD/Code/GameEngine/Include/GameNetwork/GeneralsOnline/OnlineServices_LobbyInterface.h
@@ -325,8 +325,8 @@ class NGMP_OnlineServices_LobbyInterface
 
 	void UpdateRoomDataCache(std::function<void(void)> fnCallback = nullptr);
 
-	std::function<void(LobbyMemberEntry)> m_cbPlayerDoesntHaveMap = nullptr;
-	void RegisterForPlayerDoesntHaveMapCallback(std::function<void(LobbyMemberEntry)> cb)
+	std::function<void(const LobbyMemberEntry&)> m_cbPlayerDoesntHaveMap = nullptr;
+	void RegisterForPlayerDoesntHaveMapCallback(std::function<void(const LobbyMemberEntry&)> cb)
 	{
 		m_cbPlayerDoesntHaveMap = cb;
 	}
diff --git a/GeneralsMD/Code/GameEngine/Source/GameClient/GUI/GUICallbacks/Menus/WOLGameSetupMenu.cpp b/GeneralsMD/Code/GameEngine/Source/GameClient/GUI/GUICallbacks/Menus/WOLGameSetupMenu.cpp
index ef91fdb2836..c36f3775688 100644
--- a/GeneralsMD/Code/GameEngine/Source/GameClient/GUI/GUICallbacks/Menus/WOLGameSetupMenu.cpp
+++ b/GeneralsMD/Code/GameEngine/Source/GameClient/GUI/GUICallbacks/Menus/WOLGameSetupMenu.cpp
@@ -1774,7 +1774,7 @@ void WOLGameSetupMenuInit( WindowLayout *layout, void *userData )
 	}
 
 	// player doesnt have map events
-	pLobbyInterface->RegisterForPlayerDoesntHaveMapCallback([](LobbyMemberEntry lobbyMember)
+	pLobbyInterface->RegisterForPlayerDoesntHaveMapCallback([](const LobbyMemberEntry& lobbyMember)
 		{
 			// tell the host the user doesn't have the map
 			UnicodeString mapDisplayName;