diff --git a/Detectors/FIT/FV0/base/include/FV0Base/Constants.h b/Detectors/FIT/FV0/base/include/FV0Base/Constants.h
index c91c000394856..7703eaf75b050 100644
--- a/Detectors/FIT/FV0/base/include/FV0Base/Constants.h
+++ b/Detectors/FIT/FV0/base/include/FV0Base/Constants.h
@@ -30,7 +30,7 @@ struct Constants {
   static constexpr int nTcms = 1;           // Number of trigger and clock modules (TCMs)
   static constexpr int nGbtLinks = nPms + nTcms;
   static constexpr int nFv0Channels = Geometry::getNumberOfReadoutChannels();
-  static constexpr int nFv0ChannelsPlusRef = nFv0Channels + 1;
+  static constexpr int nFv0ChannelsPlusRef = nFv0Channels + 2;
 };
 
 } // namespace fv0