Index: trunk/MagicSoft/Mars/mpointing/MSrcPosCalc.cc
===================================================================
--- trunk/MagicSoft/Mars/mpointing/MSrcPosCalc.cc	(revision 3570)
+++ trunk/MagicSoft/Mars/mpointing/MSrcPosCalc.cc	(revision 3592)
@@ -171,5 +171,5 @@
     // rotate the source position by the current rotation angle
     const Double_t rho = fPointPos->RotationAngle(*fObservatory);
-    v.Rotate(-rho);
+    v=v.Rotate(-rho);
 
     // Convert coordinates into camera plain (mm)