diff --git a/Calorimeter/CaloExample/CaloTests/src/MyAnalysisCal.cxx b/Calorimeter/CaloExample/CaloTests/src/MyAnalysisCal.cxx
index c593491334e8ce02362c50076be67c552bf54ce4..d295484870feaaf2d1917ddb378763b9621b1c52 100644
--- a/Calorimeter/CaloExample/CaloTests/src/MyAnalysisCal.cxx
+++ b/Calorimeter/CaloExample/CaloTests/src/MyAnalysisCal.cxx
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
 #include "CaloTests/AnalysisCal.h"
@@ -103,7 +103,7 @@ namespace MyAnalysisCal {
 
   double etot_cal=0;
   nhit_tot=0;
-  for (const SG::ReadHandleKey<CaloCalibrationHitContainer> k : m_calibHitContainerNames)
+  for (const SG::ReadHandleKey<CaloCalibrationHitContainer>& k : m_calibHitContainerNames)
   {
     SG::ReadHandle<CaloCalibrationHitContainer> calocalibrationhit_container (k, ctx);
     for (const CaloCalibrationHit* calibhit : *calocalibrationhit_container) {