Index: trunk/FACT++/gui/MainWindow.cc
===================================================================
--- trunk/FACT++/gui/MainWindow.cc	(revision 12203)
+++ trunk/FACT++/gui/MainWindow.cc	(revision 12208)
@@ -646,5 +646,5 @@
 {
     if (!fInHandler)
-        Dim::SendCommand("BIAS_CONTROL/SET_GAPD_REFERENCE_OFFSET", fBiasOffsetDac->value()*90./4096);
+        Dim::SendCommand("BIAS_CONTROL/SET_GAPD_REFERENCE_OFFSET", float(fBiasOffsetDac->value()*90./4096));
 }