diff --git a/wrap/qt/device_to_logical.h b/wrap/qt/device_to_logical.h
index 21262036..64a532d7 100644
--- a/wrap/qt/device_to_logical.h
+++ b/wrap/qt/device_to_logical.h
@@ -2,6 +2,8 @@
 #define DEVICE_TO_LOGICAL_H
 #include <QWidget>
 #include <QPainter>
+#include <vcg/space/point2.h>
+
 template < class ValueType>
 inline ValueType QTLogicalToDevice( QWidget *qw, const ValueType &value)
 {