diff --git a/src/app/puzzle/xml/vplayoutfilereader.cpp b/src/app/puzzle/xml/vplayoutfilereader.cpp
index 9185180c7..fc3abd790 100644
--- a/src/app/puzzle/xml/vplayoutfilereader.cpp
+++ b/src/app/puzzle/xml/vplayoutfilereader.cpp
@@ -29,6 +29,7 @@
 #include <Qt>
 #include <QFont>
 #include <QXmlStreamAttributes>
+#include <ciso646>
 #include "vplayoutfilereader.h"
 #include "vplayoutfilewriter.h"
 #include "vplayoutliterals.h"
diff --git a/src/app/puzzle/xml/vplayoutfilewriter.h b/src/app/puzzle/xml/vplayoutfilewriter.h
index a55d3e394..50a8c7342 100644
--- a/src/app/puzzle/xml/vplayoutfilewriter.h
+++ b/src/app/puzzle/xml/vplayoutfilewriter.h
@@ -33,6 +33,7 @@
 #include <QXmlStreamWriter>
 #include <QCoreApplication>
 #include <functional>
+#include <ciso646>
 
 #include "../vmisc/literals.h"
 #include "../layout/layoutdef.h"