diff --git a/Tracking/Acts/ActsGeometry/ActsGeometry/ActsMaterialTrackWriterSvc.h b/Tracking/Acts/ActsGeometry/ActsGeometry/ActsMaterialTrackWriterSvc.h
index fc1b3aa6856bf26a005f3e7227b613b1490aec77..c8aeff8c547570008f850dc0fbe71aa8629fa78e 100644
--- a/Tracking/Acts/ActsGeometry/ActsGeometry/ActsMaterialTrackWriterSvc.h
+++ b/Tracking/Acts/ActsGeometry/ActsGeometry/ActsMaterialTrackWriterSvc.h
@@ -28,7 +28,7 @@ public:
 
   ActsMaterialTrackWriterSvc( const std::string& name, ISvcLocator* svc );
 
-  void
+  virtual void
   write(const Acts::RecordedMaterialTrack& mTrack) override;
 
 private: