diff --git a/src/settings_gui.cpp b/src/settings_gui.cpp
index ee02055..1b72767 100644
--- a/src/settings_gui.cpp
+++ b/src/settings_gui.cpp
@@ -9,6 +9,8 @@
 
 /** @file settings_gui.cpp GUI for settings. */
 
+#include <map>
+
 #include "stdafx.h"
 #include "currency.h"
 #include "gui.h"