diff --git a/MuonSpectrometer/MuonDigitContainer/MuonDigitContainer/ATLAS_CHECK_THREAD_SAFETY b/MuonSpectrometer/MuonDigitContainer/MuonDigitContainer/ATLAS_CHECK_THREAD_SAFETY
new file mode 100644
index 0000000000000000000000000000000000000000..70a616520a5a6144fd8d2f578290b7643fd22eb6
--- /dev/null
+++ b/MuonSpectrometer/MuonDigitContainer/MuonDigitContainer/ATLAS_CHECK_THREAD_SAFETY
@@ -0,0 +1 @@
+MuonSpectrometer/MuonDigitContainer