Index: /trunk/Mars/mmuon/MHMuonPar.cc
===================================================================
--- /trunk/Mars/mmuon/MHMuonPar.cc	(revision 19251)
+++ /trunk/Mars/mmuon/MHMuonPar.cc	(revision 19252)
@@ -248,5 +248,9 @@
 
     ref.SetName("RefShape12mm");
+#if ROOT_VERSION_CODE < ROOT_VERSION(6,00,00)
     ref.Compile("- 0.02711*x + 0.09359");
+#else
+    ref.GetFormula()->Compile("- 0.02711*x + 0.09359");
+#endif
     gROOT->GetListOfFunctions()->Remove(ref.DrawCopy("same"));