diff --git a/core/data/CbmTsEventHeader.h b/core/data/CbmTsEventHeader.h
index 5857dbc27027e355e5bbdff79dec2549a785aa87..d77d7343d5fb87efefce13263d30eaaa6fc6f7c7 100644
--- a/core/data/CbmTsEventHeader.h
+++ b/core/data/CbmTsEventHeader.h
@@ -110,6 +110,6 @@ protected:
   /** @brief nDigis in "this" timeslice measured by the BMON */
   uint64_t fNDigisBmon = 0;
 
-  ClassDef(CbmTsEventHeader, 6)
+  ClassDef(CbmTsEventHeader, 7)
 };
 #endif