diff --git a/Trigger/TrigHypothesis/TrigBphysHypo/src/TrigEFBMuMuFex.cxx b/Trigger/TrigHypothesis/TrigBphysHypo/src/TrigEFBMuMuFex.cxx
index 92114749a94e8a5180e3e13ebbf7387d2293d457..f0190d1a12f4f73a30345f86837f0de8c9566625 100644
--- a/Trigger/TrigHypothesis/TrigBphysHypo/src/TrigEFBMuMuFex.cxx
+++ b/Trigger/TrigHypothesis/TrigBphysHypo/src/TrigEFBMuMuFex.cxx
@@ -1,7 +1,7 @@
 // -*- C++ -*-
 
 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
 /**************************************************************************
@@ -331,7 +331,7 @@ HLT::ErrorCode TrigEFBMuMuFex::acceptInputs(HLT::TEConstVec& inputTE, bool& pass
     // print debug info
     if(msgLvl() <= MSG::DEBUG) {
         int ic(0);
-        for ( const auto muelv : vec_elv_muons) {
+        for ( const auto& muelv : vec_elv_muons) {
             // loop over the vector of muon containers
             msg() << MSG::DEBUG << "MuonContainer, Got MuonEF " << ic << " Feature, size = " << muelv.size() << endmsg;
             int i(0);
@@ -360,7 +360,7 @@ HLT::ErrorCode TrigEFBMuMuFex::acceptInputs(HLT::TEConstVec& inputTE, bool& pass
             ++ic;
         } // for muons
         ic =0;
-        for ( const auto tpelv : vec_elv_tps) {
+        for ( const auto& tpelv : vec_elv_tps) {
             msg() << MSG::DEBUG <<  "SATrackParticleContainer, Got MUSA " << ic << " Feature, size = " << tpelv.size() << endmsg;
             int i(0);
             for ( const auto tpel: tpelv) {
diff --git a/Trigger/TrigHypothesis/TrigBphysHypo/src/TrigEFMultiMuFex.cxx b/Trigger/TrigHypothesis/TrigBphysHypo/src/TrigEFMultiMuFex.cxx
index b2697df0c15f4a8440a55650a46a2c2c83ccda6a..4cc889324b06e87bffc999a5db30467673dad2ac 100644
--- a/Trigger/TrigHypothesis/TrigBphysHypo/src/TrigEFMultiMuFex.cxx
+++ b/Trigger/TrigHypothesis/TrigBphysHypo/src/TrigEFMultiMuFex.cxx
@@ -1,7 +1,7 @@
 // -*- C++ -*-
 
 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
 /**************************************************************************
@@ -256,7 +256,7 @@ void TrigEFMultiMuFex::processTriMuon(HLT::TEConstVec& inputTE, xAOD::TrigBphysC
 
     if(msgLvl() <= MSG::DEBUG) {
         int ic(0);
-        for ( const auto muelv : vec_elv_muons) {
+        for ( const auto& muelv : vec_elv_muons) {
             // loop over the vector of muon containers
             msg() << MSG::DEBUG << "MuonContainer, Got MuonEF " << ic << " Feature, size = " << muelv.size() << endmsg;
             int i(0);
@@ -289,7 +289,7 @@ void TrigEFMultiMuFex::processTriMuon(HLT::TEConstVec& inputTE, xAOD::TrigBphysC
     
     std::vector<const xAOD::Muon*> uniqueMuons;
     // add all the unique muons into a single container
-    for ( const auto muelv : vec_elv_muons) {
+    for ( const auto& muelv : vec_elv_muons) {
         for ( const auto muel : muelv ) {
             m_bphysHelperTool->addUnique( *muel, uniqueMuons, 0.005,0.005,10,xAOD::Muon::InnerDetectorTrackParticle);
         } // loop over muonEL in each roi