diff --git a/Trigger/TrigMonitoring/TrigMuonMonitoring/src/CommonMon.cxx b/Trigger/TrigMonitoring/TrigMuonMonitoring/src/CommonMon.cxx
index e470095b0b5908276936a4db0f524214e0ac1b19..a36468add57c6f9fbd9a4d37468154db3ba77422 100644
--- a/Trigger/TrigMonitoring/TrigMuonMonitoring/src/CommonMon.cxx
+++ b/Trigger/TrigMonitoring/TrigMuonMonitoring/src/CommonMon.cxx
@@ -1460,6 +1460,7 @@ StatusCode HLTMuonMonTool::fillCommonDQA()
   for (int i = 0; i <= m_maxESbr; i++) {
     m_passedES[i] = false;
   }
+  m_passedESNONISO = false;
 
   if (m_requestESchains) {
     std::vector<std::string>::iterator itrES;