Index: trunk/MagicSoft/Mars/mhist/MHHillas.cc
===================================================================
--- trunk/MagicSoft/Mars/mhist/MHHillas.cc	(revision 986)
+++ trunk/MagicSoft/Mars/mhist/MHHillas.cc	(revision 995)
@@ -80,5 +80,5 @@
 void MHHillas::Fill(const MParContainer *par)
 {
-    MHillas &h = *(MHillas*)par;
+    const MHillas &h = *(MHillas*)par;
 
     fAlpha ->Fill(fabs(h.GetAlpha()));