diff --git a/Simulation/Overlay/OverlayByteStreamUtils/ATLAS_CHECK_THREAD_SAFETY b/Simulation/Overlay/OverlayByteStreamUtils/ATLAS_CHECK_THREAD_SAFETY
new file mode 100644
index 0000000000000000000000000000000000000000..66b09d7bda6f96aa3dbc0c9520fbb3ba3df9a49a
--- /dev/null
+++ b/Simulation/Overlay/OverlayByteStreamUtils/ATLAS_CHECK_THREAD_SAFETY
@@ -0,0 +1 @@
+Simulation/Overlay/OverlayByteStreamUtils
diff --git a/Simulation/Overlay/OverlayByteStreamUtils/CMakeLists.txt b/Simulation/Overlay/OverlayByteStreamUtils/CMakeLists.txt
index 6aef1824ce67b89eb45dbc4b5609a609aebb57ab..be498632427c4457007cd05d3a9af76389e4c138 100644
--- a/Simulation/Overlay/OverlayByteStreamUtils/CMakeLists.txt
+++ b/Simulation/Overlay/OverlayByteStreamUtils/CMakeLists.txt
@@ -1,4 +1,4 @@
-# Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
+# Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
 
 # Declare the package name:
 atlas_subdir( OverlayByteStreamUtils )
@@ -11,7 +11,7 @@ atlas_add_component( OverlayByteStreamUtils
                      src/*.cxx
                      src/components/*.cxx
                      INCLUDE_DIRS ${ROOT_INCLUDE_DIRS}
-                     LINK_LIBRARIES ${ROOT_LIBRARIES} AthenaBaseComps AthenaKernel ByteStreamCnvSvcLib GaudiKernel TrigConfData TrigConfInterfaces TrigDecisionToolLib )
+                     LINK_LIBRARIES ${ROOT_LIBRARIES} AthenaBaseComps AthenaKernel ByteStreamCnvSvcLib CxxUtils GaudiKernel TrigConfData TrigConfInterfaces TrigDecisionToolLib )
 
 # Utility scripts
 atlas_install_runtime( scripts/*.py )
diff --git a/Simulation/Overlay/OverlayByteStreamUtils/src/ByteStreamMultipleOutputStreamCopyTool.cxx b/Simulation/Overlay/OverlayByteStreamUtils/src/ByteStreamMultipleOutputStreamCopyTool.cxx
index ad96edf4fb5cfbbaa84d37e63a6d6d8be9f1a25f..15300a1c4f73e2f70e5a9e0cf7fdf3c8fb10dae4 100644
--- a/Simulation/Overlay/OverlayByteStreamUtils/src/ByteStreamMultipleOutputStreamCopyTool.cxx
+++ b/Simulation/Overlay/OverlayByteStreamUtils/src/ByteStreamMultipleOutputStreamCopyTool.cxx
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
 */
 
 /** @file ByteStreamMultipleOutputStreamCopyTool.cxx
@@ -21,6 +21,9 @@
 #include "TRandom3.h"
 #include <stdexcept>
 
+#include "CxxUtils/checker_macros.h"
+ATLAS_NO_CHECK_FILE_THREAD_SAFETY;  // this code is obsolete/unused (certainly in production)
+
 TRandom3 myrand;
 
 class lbninfo{
diff --git a/Simulation/Overlay/OverlayByteStreamUtils/src/ByteStreamMultipleOutputStreamCopyTool.h b/Simulation/Overlay/OverlayByteStreamUtils/src/ByteStreamMultipleOutputStreamCopyTool.h
index 6545a7789a69918104b416a706c44a779eba56f8..397c9c7b8103e43bd3d0e5f92b1953a1f89e5e90 100644
--- a/Simulation/Overlay/OverlayByteStreamUtils/src/ByteStreamMultipleOutputStreamCopyTool.h
+++ b/Simulation/Overlay/OverlayByteStreamUtils/src/ByteStreamMultipleOutputStreamCopyTool.h
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
 */
 
 #ifndef  OVERLAYBYTESTREAMUTILS_BYTESTREAMMULTIPLEOUTPUTSTREAMCOPYTOOL_H
@@ -30,6 +30,9 @@
 #include "ByteStreamCnvSvc/ByteStreamInputSvc.h"
 #include "ByteStreamCnvSvc/ByteStreamOutputSvc.h"
 
+#include "CxxUtils/checker_macros.h"
+ATLAS_NO_CHECK_FILE_THREAD_SAFETY;  // this code is obsolete/unused (certainly in production)
+
 //<<<<<< CLASS DECLARATIONS                                             >>>>>>