--- src/sensors/qsensor.h.orig	2011-05-10 10:06:12.000000000 +0200
+++ src/sensors/qsensor.h	2012-04-17 17:53:56.929435501 +0200
@@ -172,7 +172,7 @@
     virtual bool filter(QSensorReading *reading) = 0;
 protected:
     QSensorFilter();
-    ~QSensorFilter();
+    virtual ~QSensorFilter();
     virtual void setSensor(QSensor *sensor);
     QSensor *m_sensor;
 };