diff --git a/wrap/qt/device_to_logical.h b/wrap/qt/device_to_logical.h
index 64a532d7..2497e43a 100644
--- a/wrap/qt/device_to_logical.h
+++ b/wrap/qt/device_to_logical.h
@@ -26,6 +26,17 @@ inline ValueType QTLogicalToDevice( QPainter *qp, const ValueType &value)
 #endif
 }
 
+template < class ValueType>
+inline ValueType QTDeviceToLogical( QWidget *qw, const ValueType &value)
+{
+#if QT_VERSION >= 0x050000
+  return value/qw->devicePixelRatio() ;
+#else
+  Q_UNUSED(qw);
+  return value;
+#endif
+}
+
 template < class ValueType>
 inline ValueType QTDeviceToLogical( QPainter *qp, const ValueType &value)
 {