diff --git a/InnerDetector/InDetRecTools/SiZvertexTool_xk/SiZvertexTool_xk/ATLAS_CHECK_THREAD_SAFETY b/InnerDetector/InDetRecTools/SiZvertexTool_xk/SiZvertexTool_xk/ATLAS_CHECK_THREAD_SAFETY
new file mode 100644
index 0000000000000000000000000000000000000000..5addf7afcf4ea81c0e75fc2ed1b55ba8c48c0485
--- /dev/null
+++ b/InnerDetector/InDetRecTools/SiZvertexTool_xk/SiZvertexTool_xk/ATLAS_CHECK_THREAD_SAFETY
@@ -0,0 +1 @@
+InnerDetector/InDetRecTools/SiZvertexTool_xk