diff --git a/MuonSpectrometer/MuonValidation/MuonDQA/MuonRawDataMonitoring/MdtRawDataMonitoring/src/MdtRawDataValAlg.cxx b/MuonSpectrometer/MuonValidation/MuonDQA/MuonRawDataMonitoring/MdtRawDataMonitoring/src/MdtRawDataValAlg.cxx
index 435359a5b4d8b083950e25fa0fcf26ecb8b57c6d..12fb523b0c829d65ac37cd98b3ff3f9a6ce17ea0 100755
--- a/MuonSpectrometer/MuonValidation/MuonDQA/MuonRawDataMonitoring/MdtRawDataMonitoring/src/MdtRawDataValAlg.cxx
+++ b/MuonSpectrometer/MuonValidation/MuonDQA/MuonRawDataMonitoring/MdtRawDataMonitoring/src/MdtRawDataValAlg.cxx
@@ -1665,7 +1665,7 @@ StatusCode MdtRawDataValAlg::bookMDTOverviewHistograms(/* bool isNewEventsBlock,
     ////////////////////////////////////////////////////////////////////////////////////// 
     //histo path for TotalNumber_of_MDT_hits_per_event without a cut on ADC 
     sc = bookMDTHisto_overview(m_mdteventsLumi, "TotalNumber_of_MDT_hits_per_event", "[counts]", "Number of Events",
-                               500, 0., 10000., m_mg->mongroup_overview_shiftLumi);
+                               500, 0., 20000., m_mg->mongroup_overview_shiftLumi);
     
      
     //////////////////////////////////////////////////////////////////////////////////////