diff --git a/fles/mcbm2018/tasks/CbmMcbmCheckTimingAlgo.h b/fles/mcbm2018/tasks/CbmMcbmCheckTimingAlgo.h
index 07f6b5f0f155ba680f398d2b3ab0a891f90d9ded..56997e651bb6d91279cd0f375ec64ea9a5158e37 100644
--- a/fles/mcbm2018/tasks/CbmMcbmCheckTimingAlgo.h
+++ b/fles/mcbm2018/tasks/CbmMcbmCheckTimingAlgo.h
@@ -132,7 +132,7 @@ private:
   /** Name of the histogram output file **/
   TString fOutFileName = "data/HistosCheckTiming.root";
 
-  ClassDef(CbmMcbmCheckTimingAlgo, 1);
+  ClassDefNV(CbmMcbmCheckTimingAlgo, 1);
 };
 
 #endif