diff -ruN kradio-4.0.0.orig//plugins/gui-standard-display/radioview_frequencyradio.cpp kradio-4.0.0/plugins/gui-standard-display/radioview_frequencyradio.cpp
--- kradio-4.0.0.orig//plugins/gui-standard-display/radioview_frequencyradio.cpp	2010-09-21 13:08:48.000000000 +0100
+++ kradio-4.0.0/plugins/gui-standard-display/radioview_frequencyradio.cpp	2010-09-21 13:09:48.672043572 +0100
@@ -408,7 +408,7 @@
 
     // auxiliary variables
     qreal   margin = qMax(4.0, qMin(width / 50.0, height / 50.0));
-    qreal   tmp    = qMin(height, (width - 2 * margin) / 6.0);
+    qreal   tmp    = qMin(height, (width - 2 * margin) / qreal(6.0));
     qreal   xd_st  = qMin((height - margin * 2) / 3.0, tmp / 3.0);
     qreal   xw     = qMin(tmp / 2.0, xd_st * 1.5);
     qreal   penw   = qMax(1.0, xw / 25.0);