diff --git a/Simulation/G4Extensions/G4HitFilter/ATLAS_CHECK_THREAD_SAFETY b/Simulation/G4Extensions/G4HitFilter/ATLAS_CHECK_THREAD_SAFETY
new file mode 100644
index 0000000000000000000000000000000000000000..a842c9e8394390582d1e135facc7aa43e29632c9
--- /dev/null
+++ b/Simulation/G4Extensions/G4HitFilter/ATLAS_CHECK_THREAD_SAFETY
@@ -0,0 +1 @@
+Simulation/G4Extensions/G4HitFilter