diff --git a/src/app/puzzle/xml/vplayoutfilewriter.h b/src/app/puzzle/xml/vplayoutfilewriter.h
index 04cb8e323..3e362a788 100644
--- a/src/app/puzzle/xml/vplayoutfilewriter.h
+++ b/src/app/puzzle/xml/vplayoutfilewriter.h
@@ -32,6 +32,7 @@
 #include <QLocale>
 #include <QXmlStreamWriter>
 #include <QCoreApplication>
+#include <functional>
 
 #include "../vmisc/literals.h"