diff --git a/Trigger/TrigT1/TrigT1CaloMonitoring/src/EfexMonitorAlgorithm.cxx b/Trigger/TrigT1/TrigT1CaloMonitoring/src/EfexMonitorAlgorithm.cxx
index 364370c3b53889ff980337e73620ef05c66daac5..f91bac5ce126bed1f5b4a209fc85a8eb3520252c 100644
--- a/Trigger/TrigT1/TrigT1CaloMonitoring/src/EfexMonitorAlgorithm.cxx
+++ b/Trigger/TrigT1/TrigT1CaloMonitoring/src/EfexMonitorAlgorithm.cxx
@@ -150,7 +150,7 @@ StatusCode EfexMonitorAlgorithm::fillEMHistograms(const std::string& groupName,
       fill(groupName, TOBWstot_threshold);
       int iPhi = efexEmRoI->iPhi();
       if (iPhi>31) iPhi -= 64;
-      binNumber = (iPhi+32)*50 + 25 + efexEmRoI->iEta();
+      binNumber = (iPhi+32)*50 + 26 + efexEmRoI->iEta();
       fill(groupName,binNumber,lbn);
     }
   }