diff --git a/Tracking/Acts/ActsGeometry/ActsGeometry/ActsObjWriterTool.h b/Tracking/Acts/ActsGeometry/ActsGeometry/ActsObjWriterTool.h
index 945de291de1b0fe559cf9d984b0425df2a06a0d9..23f101e8f8584a48d2b5474306a2a84fffe5198f 100644
--- a/Tracking/Acts/ActsGeometry/ActsGeometry/ActsObjWriterTool.h
+++ b/Tracking/Acts/ActsGeometry/ActsGeometry/ActsObjWriterTool.h
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
 */
 
 #ifndef ACTSGEOMETRY_ACTSOBJWRITERTOOL_H
@@ -36,7 +36,7 @@ public:
     const IInterface* parent);
 
   void
-  write(const ActsGeometryContext& gctx, const Acts::TrackingGeometry&);
+  write(const ActsGeometryContext& gctx, const Acts::TrackingGeometry&) const;
 
 private:
 
diff --git a/Tracking/Acts/ActsGeometry/src/ActsObjWriterTool.cxx b/Tracking/Acts/ActsGeometry/src/ActsObjWriterTool.cxx
index 53304d0a7fe09862460e2e620992babb0749b3d9..21c97a0b5cc135f1e4f69dd6816868bd9a7ee9ac 100644
--- a/Tracking/Acts/ActsGeometry/src/ActsObjWriterTool.cxx
+++ b/Tracking/Acts/ActsGeometry/src/ActsObjWriterTool.cxx
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration
 */
 
 #include "ActsGeometry/ActsObjWriterTool.h"
@@ -37,7 +37,7 @@ ActsObjWriterTool::initialize()
 }
 
 void
-ActsObjWriterTool::write(const ActsGeometryContext& gctx, const Acts::TrackingGeometry& tg)
+ActsObjWriterTool::write(const ActsGeometryContext& gctx, const Acts::TrackingGeometry& tg) const
 {
 
   const auto& ctx = Gaudi::Hive::currentContext();