diff --git a/qwt/null_paintdevice.py b/qwt/null_paintdevice.py
index 80d0877..091443f 100644
--- a/qwt/null_paintdevice.py
+++ b/qwt/null_paintdevice.py
@@ -275,7 +275,7 @@ def metric(self, deviceMetric):
         elif deviceMetric == QPaintDevice.PdmDevicePixelRatio:
             value = 1
         elif deviceMetric == QPaintDevice.PdmDevicePixelRatioScaled:
-            value = 1
+            value = 0x10000
         else:
             value = super(QwtNullPaintDevice, self).metric(deviceMetric)
         return value