diff --git a/Tracking/Acts/ActsGeometry/ActsGeometry/ActsExtrapolationAlg.h b/Tracking/Acts/ActsGeometry/ActsGeometry/ActsExtrapolationAlg.h
index d87153490dbf123def419f9078d6f3bbf0970b07..88776414085941ce55990d390f6005a22da8048e 100755
--- a/Tracking/Acts/ActsGeometry/ActsGeometry/ActsExtrapolationAlg.h
+++ b/Tracking/Acts/ActsGeometry/ActsGeometry/ActsExtrapolationAlg.h
@@ -25,7 +25,7 @@
 namespace Acts {
   class TrackingGeometry;
   namespace detail {
-    class Step;
+    struct Step;
   }
 }
 
diff --git a/Tracking/Acts/ActsGeometry/ActsGeometry/IActsPropStepRootWriterSvc.h b/Tracking/Acts/ActsGeometry/ActsGeometry/IActsPropStepRootWriterSvc.h
index abcde5cd7fa2e8cce3768000d2ecf431f497f3e2..e7653a923bcfffd8928e58b70cd9df17cc2c7984 100644
--- a/Tracking/Acts/ActsGeometry/ActsGeometry/IActsPropStepRootWriterSvc.h
+++ b/Tracking/Acts/ActsGeometry/ActsGeometry/IActsPropStepRootWriterSvc.h
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
 #ifndef ACTSGEOMETRY_IACTSPROPSTEPROOTWRITERSVC_H
@@ -10,7 +10,7 @@
 
 namespace Acts {
   namespace detail {
-    class Step;
+    struct Step;
   }
 }
 
diff --git a/Tracking/Acts/ActsGeometry/src/ActsPropStepRootWriterSvc.cxx b/Tracking/Acts/ActsGeometry/src/ActsPropStepRootWriterSvc.cxx
index 6229793ec97c2e20f0f6de51dfa8761f43da190f..5e8c33835bd5ab150553a839494de1da941f59da 100644
--- a/Tracking/Acts/ActsGeometry/src/ActsPropStepRootWriterSvc.cxx
+++ b/Tracking/Acts/ActsGeometry/src/ActsPropStepRootWriterSvc.cxx
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 */
 
 #include "ActsGeometry/ActsPropStepRootWriterSvc.h"
@@ -120,8 +120,6 @@ ActsPropStepRootWriterSvc::writeThread()
 void
 ActsPropStepRootWriterSvc::doWrite(const StepVector& steps, size_t evtNum)
 {
-  using ag = Acts::GeometryIdentifier;
-
   m_eventNum = evtNum;
   m_s_pX.clear();
   m_s_pY.clear();