diff --git a/MuonSpectrometer/MuonGeoModel/MuonGeoModel/MuonDetectorTool.h b/MuonSpectrometer/MuonGeoModel/MuonGeoModel/MuonDetectorTool.h
index 9e7b4eec6bde9601180360854d576f274d650125..8fec733c6d15ba07396770a3dd57f6399d13b0de 100755
--- a/MuonSpectrometer/MuonGeoModel/MuonGeoModel/MuonDetectorTool.h
+++ b/MuonSpectrometer/MuonGeoModel/MuonGeoModel/MuonDetectorTool.h
@@ -14,7 +14,7 @@ namespace MuonGM
 }
 
 
-class MuonDetectorTool : public GeoModelTool {
+class MuonDetectorTool final : public GeoModelTool {
 
 public: