diff --git a/retroshare-gui/src/gui/chat/ChatLobbyDialog.h b/retroshare-gui/src/gui/chat/ChatLobbyDialog.h
index f70eb27a6..6f3f52096 100644
--- a/retroshare-gui/src/gui/chat/ChatLobbyDialog.h
+++ b/retroshare-gui/src/gui/chat/ChatLobbyDialog.h
@@ -28,6 +28,7 @@
 #include "ChatDialog.h"
 
 Q_DECLARE_METATYPE(RsGxsId)
+Q_DECLARE_METATYPE(QList<RsGxsId>)
 
 class GxsIdChooser ;
 class QToolButton;