diff --git a/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCandidateTool.h b/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCandidateTool.h
index 646f3175f0d2b5d5803eea904977b30e162a8cd6..35d37fcf667cd3c050b54b7103dd7674ea0a9721 100644
--- a/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCandidateTool.h
+++ b/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCandidateTool.h
@@ -28,7 +28,7 @@ namespace MuonCombined {
 
 
     /**IMuonCandidateTool interface: build a MuonCandidateCollection from a TrackCollection of spectrometer tracks */
-    virtual void create( const xAOD::TrackParticleContainer& tracks, MuonCandidateCollection& outputCollection ) const = 0;
+    virtual void create( const xAOD::TrackParticleContainer& tracks, MuonCandidateCollection& outputCollection ) = 0;
 
   };
 
diff --git a/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedInDetExtensionTool.h b/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedInDetExtensionTool.h
index a656d8a338c108bd34bc7df979caef36f99fbb5c..5e34e4355800c354b6d6f0baf16173a02dc2b58f 100644
--- a/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedInDetExtensionTool.h
+++ b/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedInDetExtensionTool.h
@@ -27,7 +27,7 @@ namespace MuonCombined {
 
 
     /**IMuonCombinedInDetExtensionTool interface: build combined muons from ID and MS candidates */    
-    virtual void extend( const InDetCandidateCollection& inDetCandidates ) const = 0;
+    virtual void extend( const InDetCandidateCollection& inDetCandidates ) = 0;
 
   };
 
diff --git a/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedTagTool.h b/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedTagTool.h
index a18f959b83597f616a63f5ae4e0cfaf5d2dc9f0f..67e6c1c0769130dd2aee4484f462884719a7efdd 100644
--- a/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedTagTool.h
+++ b/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedTagTool.h
@@ -30,7 +30,7 @@ namespace MuonCombined {
 
 
     /**IMuonCombinedTagTool interface: build combined  muons from a muon and a vector of indet candidates */    
-    virtual void combine( const MuonCandidate& muonCandidate, const std::vector<InDetCandidate*>& indetCandidates ) = 0;
+    virtual void combine( const MuonCandidate& muonCandidate, const std::vector<InDetCandidate*>& indetCandidates ) const = 0;
 
   };
 
diff --git a/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedTrigCaloTagExtensionTool.h b/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedTrigCaloTagExtensionTool.h
index 35ffe80ff5a59db0e4263f46b0f0968eb92614d5..c4b01e7f53b0d9532dcf5c2a056ab0e3c8f3e8a7 100644
--- a/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedTrigCaloTagExtensionTool.h
+++ b/Reconstruction/MuonIdentification/MuonCombinedToolInterfaces/MuonCombinedToolInterfaces/IMuonCombinedTrigCaloTagExtensionTool.h
@@ -31,7 +31,7 @@ namespace MuonCombined {
     /**IMuonCombinedTrigCaloTagExtensionTool interface: build combined muons from ID and MS candidates */    
     virtual void extend( const InDetCandidateCollection& inDetCandidates, 
                          const CaloCellContainer* caloCellCont = nullptr,
-                         const xAOD::CaloClusterContainer* caloClusterCont = nullptr ) const = 0;
+                         const xAOD::CaloClusterContainer* caloClusterCont = nullptr ) = 0;
   };
 
   inline const InterfaceID& IMuonCombinedTrigCaloTagExtensionTool::interfaceID()