diff --git a/LArCalorimeter/LArG4/LArG4SD/ATLAS_CHECK_THREAD_SAFETY b/LArCalorimeter/LArG4/LArG4SD/ATLAS_CHECK_THREAD_SAFETY
new file mode 100644
index 0000000000000000000000000000000000000000..1ec81f99791111960869263f0210b566f90725dc
--- /dev/null
+++ b/LArCalorimeter/LArG4/LArG4SD/ATLAS_CHECK_THREAD_SAFETY
@@ -0,0 +1 @@
+LArCalorimeter/LArG4/LArG4SD