diff --git a/retroshare-gui/src/gui/ChatLobbyWidget.cpp b/retroshare-gui/src/gui/ChatLobbyWidget.cpp
index d21b08523..3e00e358d 100644
--- a/retroshare-gui/src/gui/ChatLobbyWidget.cpp
+++ b/retroshare-gui/src/gui/ChatLobbyWidget.cpp
@@ -4,6 +4,7 @@
 #include <QMenu>
 #include <QMessageBox>
 #include <time.h>
+#include <algorithm>
 #include "ChatLobbyWidget.h"
 #include "chat/CreateLobbyDialog.h"
 #include "chat/ChatTabWidget.h"