diff --git a/Trigger/TrigHypothesis/TrigMuonHypoMT/src/TrigMufastHypoTool.cxx b/Trigger/TrigHypothesis/TrigMuonHypoMT/src/TrigMufastHypoTool.cxx
index 19ebae5bcf9dc46d4597a73a66003122afbb809b..d975a6c2cfd41ac389d3779d84e28da055980d44 100644
--- a/Trigger/TrigHypothesis/TrigMuonHypoMT/src/TrigMufastHypoTool.cxx
+++ b/Trigger/TrigHypothesis/TrigMuonHypoMT/src/TrigMufastHypoTool.cxx
@@ -322,9 +322,9 @@ StatusCode TrigMufastHypoTool::inclusiveSelection(std::vector<TrigMufastHypoTool
 StatusCode TrigMufastHypoTool::multiplicitySelection(std::vector<TrigMufastHypoTool::MuonClusterInfo>& toolInput) const{
 
    HLT::Index2DVec passingSelection( m_ptBins.size() );
+   size_t elementIndex{ 0 };
 
    for ( size_t cutIndex=0; cutIndex < m_ptBins.size(); ++cutIndex ) {
-      size_t elementIndex{ 0 };      
       for ( auto& i: toolInput ) {
 
 	if(!m_acceptAll && m_applyOR && !i.passOR) {
@@ -332,6 +332,8 @@ StatusCode TrigMufastHypoTool::multiplicitySelection(std::vector<TrigMufastHypoT
 	  continue;
 	}
 
+	elementIndex = &i - &toolInput.front();
+
          // If muon event has difference DecisionID, it shouldn't apply.
          if ( TrigCompositeUtils::passed( m_decisionId.numeric(), i.previousDecisionIDs ) ) {
             if ( decideOnSingleObject( i, cutIndex ) == true ) {
@@ -343,7 +345,6 @@ StatusCode TrigMufastHypoTool::multiplicitySelection(std::vector<TrigMufastHypoT
          } else {
             ATH_MSG_DEBUG("Not match DecisionID " << m_decisionId );
          }
-         elementIndex++;
       }
 
       // If no object passes the selection, multipul selection should stop.
diff --git a/Trigger/TrigHypothesis/TrigMuonHypoMT/src/TrigmuCombHypoTool.cxx b/Trigger/TrigHypothesis/TrigMuonHypoMT/src/TrigmuCombHypoTool.cxx
index 106859d6ca42b8f530d31db25ed023f7151a0c63..dc4323fef1c0fed9a47ec5d35e2d9a774edfe370 100644
--- a/Trigger/TrigHypothesis/TrigMuonHypoMT/src/TrigmuCombHypoTool.cxx
+++ b/Trigger/TrigHypothesis/TrigMuonHypoMT/src/TrigmuCombHypoTool.cxx
@@ -275,9 +275,9 @@ StatusCode TrigmuCombHypoTool::inclusiveSelection(std::vector<TrigmuCombHypoTool
 StatusCode TrigmuCombHypoTool::multiplicitySelection(std::vector<TrigmuCombHypoTool::CombinedMuonInfo>& input) const
 {
    HLT::Index2DVec passingSelection( m_ptBins.size() );
+   size_t elementIndex{ 0 };
 
    for ( size_t cutIndex=0; cutIndex < m_ptBins.size(); ++cutIndex ) {
-      size_t elementIndex{ 0 };      
       for ( auto& i: input ) {
 
 	if(!m_acceptAll && m_applyOR && !i.passOR) {
@@ -285,6 +285,8 @@ StatusCode TrigmuCombHypoTool::multiplicitySelection(std::vector<TrigmuCombHypoT
 	  continue;
 	}
 
+	elementIndex = &i - &input.front();
+
          // If muon event has difference DecisionID, it shouldn't apply.
          if ( TrigCompositeUtils::passed( m_decisionId.numeric(), i.previousDecisionIDs ) ) {
             if ( decideOnSingleObject( i, cutIndex ) == true ) {
@@ -296,7 +298,6 @@ StatusCode TrigmuCombHypoTool::multiplicitySelection(std::vector<TrigmuCombHypoT
          } else {
             ATH_MSG_DEBUG("Not match DecisionID " << m_decisionId );
          }
-         elementIndex++;
       }
 
       // If no object passes the selection, multipul selection should stop.