diff --git a/src/classes/PRunDataHandler.cpp b/src/classes/PRunDataHandler.cpp
index 386f3a5a..43666844 100644
--- a/src/classes/PRunDataHandler.cpp
+++ b/src/classes/PRunDataHandler.cpp
@@ -5605,6 +5605,7 @@ Bool_t PRunDataHandler::WritePsiBinFile(TString fln)
       if (hNCrop[i] == hNCrop[j]) {
         std::string nn = std::to_string(ival);
         hNCrop[j][3] = nn[0];
+        ival++;
       }
     }
   }