diff --git a/src/libs/ifc/xml/utils.cpp b/src/libs/ifc/xml/utils.cpp
index 2c4a591c1..851be4490 100644
--- a/src/libs/ifc/xml/utils.cpp
+++ b/src/libs/ifc/xml/utils.cpp
@@ -34,6 +34,7 @@
 #include <QSet>
 #include <QStringList>
 #include <QSvgRenderer>
+#include <ciso646>
 
 #include "../vmisc/compatibility.h"
 
diff --git a/src/libs/ifc/xml/vbackgroundpatternimage.cpp b/src/libs/ifc/xml/vbackgroundpatternimage.cpp
index 324865816..b3624b8f7 100644
--- a/src/libs/ifc/xml/vbackgroundpatternimage.cpp
+++ b/src/libs/ifc/xml/vbackgroundpatternimage.cpp
@@ -37,6 +37,7 @@
 #include <QPixmap>
 #include <QBuffer>
 #include <QImageReader>
+#include <ciso646>
 
 //---------------------------------------------------------------------------------------------------------------------
 auto VBackgroundPatternImage::FromFile(const QString &fileName, bool builtIn) -> VBackgroundPatternImage
diff --git a/src/libs/ifc/xml/vpatternimage.cpp b/src/libs/ifc/xml/vpatternimage.cpp
index ecb49d458..a12d3ca88 100644
--- a/src/libs/ifc/xml/vpatternimage.cpp
+++ b/src/libs/ifc/xml/vpatternimage.cpp
@@ -38,6 +38,7 @@
 #include <QBuffer>
 #include <QSize>
 #include <QFile>
+#include <ciso646>
 
 #include "utils.h"
 #include "../vmisc/compatibility.h"