diff --git a/ForwardDetectors/ZDC/ZdcIdentifier/ZdcIdentifier/ATLAS_CHECK_THREAD_SAFETY b/ForwardDetectors/ZDC/ZdcIdentifier/ZdcIdentifier/ATLAS_CHECK_THREAD_SAFETY
new file mode 100644
index 0000000000000000000000000000000000000000..a62654cc210865c6fa65e7be393021bea2ce1084
--- /dev/null
+++ b/ForwardDetectors/ZDC/ZdcIdentifier/ZdcIdentifier/ATLAS_CHECK_THREAD_SAFETY
@@ -0,0 +1 @@
+ForwardDetectors/ZDC/ZdcIdentifier