diff --git a/Control/AthenaExamples/AthExHive/src/HiveExSvc.h b/Control/AthenaExamples/AthExHive/src/HiveExSvc.h
index 646241e5c8dbbc3f1377b4adaee43c174b7cfcef..b3efd251928227a5d4bde32d4103f8fe3cbd408c 100644
--- a/Control/AthenaExamples/AthExHive/src/HiveExSvc.h
+++ b/Control/AthenaExamples/AthExHive/src/HiveExSvc.h
@@ -30,7 +30,7 @@ public:
   virtual StatusCode initialize() override;
   virtual StatusCode finalize() override;
   
-  void add(const std::string&, const unsigned int&);
+  virtual void add(const std::string&, const unsigned int&) override;
 
 private:
 
diff --git a/MuonSpectrometer/MuonReconstruction/MuonPatternFinders/MuonPatternFinderTools/MuonHoughPatternTools/MuonHoughPatternTools/MuonHoughPatternFinderTool.h b/MuonSpectrometer/MuonReconstruction/MuonPatternFinders/MuonPatternFinderTools/MuonHoughPatternTools/MuonHoughPatternTools/MuonHoughPatternFinderTool.h
index 4181502687689f6b4bbd824d08e2f496684ec871..be13bbe8296ddb49928ead94acb9fdf8cc37a863 100644
--- a/MuonSpectrometer/MuonReconstruction/MuonPatternFinders/MuonPatternFinderTools/MuonHoughPatternTools/MuonHoughPatternTools/MuonHoughPatternFinderTool.h
+++ b/MuonSpectrometer/MuonReconstruction/MuonPatternFinders/MuonPatternFinderTools/MuonHoughPatternTools/MuonHoughPatternTools/MuonHoughPatternFinderTool.h
@@ -38,9 +38,9 @@ namespace Muon {
         virtual ~MuonHoughPatternFinderTool();
 
         /** initialize */
-        virtual StatusCode initialize();
+        virtual StatusCode initialize() override;
         /** finalize */
-        virtual StatusCode finalize();
+        virtual StatusCode finalize() override;
 
         /** find patterns for a give set of MuonPrepData collections + optionally CSC
          * segment combinations */
diff --git a/MuonSpectrometer/MuonReconstruction/MuonPatternFinders/MuonPatternFinderTools/MuonHoughPatternTools/MuonHoughPatternTools/MuonHoughPatternTool.h b/MuonSpectrometer/MuonReconstruction/MuonPatternFinders/MuonPatternFinderTools/MuonHoughPatternTools/MuonHoughPatternTools/MuonHoughPatternTool.h
index e683dc4d323dfc08d533fe053351ca938ac763ec..1e4be7f865e72c8ec6174eeddb60654c36ddf36c 100755
--- a/MuonSpectrometer/MuonReconstruction/MuonPatternFinders/MuonPatternFinderTools/MuonHoughPatternTools/MuonHoughPatternTools/MuonHoughPatternTool.h
+++ b/MuonSpectrometer/MuonReconstruction/MuonPatternFinders/MuonPatternFinderTools/MuonHoughPatternTools/MuonHoughPatternTools/MuonHoughPatternTool.h
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 */
 
 #ifndef MUONHOUGHPATTERNTOOLS_MUONHOUGHPATTERNTOOL_H
@@ -37,7 +37,7 @@ public:
     virtual std::unique_ptr<MuonPrdPatternCollection> getEtaMuonPatterns(MuonHoughPatternContainerShip& houghpatterns) const override;
 
     /** creates houghpatterns, called from FinderTool */
-    MuonHoughPatternContainerShip emptyHoughPattern() const;
+    virtual MuonHoughPatternContainerShip emptyHoughPattern() const override;
 
 private:
     /** method that builds the patterns */