diff --git a/PWGUD/DataModel/TauThreeProngEventTables.h b/PWGUD/DataModel/TauThreeProngEventTables.h
index e01daca155a..01a01145008 100644
--- a/PWGUD/DataModel/TauThreeProngEventTables.h
+++ b/PWGUD/DataModel/TauThreeProngEventTables.h
@@ -37,7 +37,8 @@ DECLARE_SOA_COLUMN(RctOk, rctOk, int);
 // DECLARE_SOA_COLUMN(PosX, posX, float);
 // DECLARE_SOA_COLUMN(PosY, posY, float);
 DECLARE_SOA_COLUMN(PosZ, posZ, float);
-DECLARE_SOA_COLUMN(FlagUPC, flagUPC, int8_t);
+// DECLARE_SOA_COLUMN(FlagUPC, flagUPC, int8_t);
+DECLARE_SOA_COLUMN(FlagUPC, flagUPC, unsigned short);
 DECLARE_SOA_COLUMN(OccupancyInTime, occupancyInTime, int);
 DECLARE_SOA_COLUMN(HadronicRate, hadronicRate, double);
 DECLARE_SOA_COLUMN(Trs, trs, int8_t);
diff --git a/PWGUD/TableProducer/tauThreeProngEventTableProducer.cxx b/PWGUD/TableProducer/tauThreeProngEventTableProducer.cxx
index c90139faac4..3254d10b5c8 100644
--- a/PWGUD/TableProducer/tauThreeProngEventTableProducer.cxx
+++ b/PWGUD/TableProducer/tauThreeProngEventTableProducer.cxx
@@ -862,6 +862,8 @@ struct TauThreeProngEventTableProducer {
       counterTmp++;
     }
 
+    // Vertex::Flags::UPCMode
+    // UPCMode = 0x1 << 1
     dataTauFourTracks(dgcand.runNumber(),
                       dgcand.globalBC(), // is it necessary
                       dgtracks.size(),