diff --git a/InnerDetector/InDetConditions/TRT_ConditionsServices/src/TRT_StrawNeighbourSvc.h b/InnerDetector/InDetConditions/TRT_ConditionsServices/src/TRT_StrawNeighbourSvc.h
index 12a86b8741a40f665bdfb5175aaacc7224924051..7adf571aa02f61ac68ff53db0f34bb1e6d7b786f 100755
--- a/InnerDetector/InDetConditions/TRT_ConditionsServices/src/TRT_StrawNeighbourSvc.h
+++ b/InnerDetector/InDetConditions/TRT_ConditionsServices/src/TRT_StrawNeighbourSvc.h
@@ -19,7 +19,7 @@
 class TRT_ID;
 class StoreGateSvc;
 
-class TRT_StrawNeighbourSvc: public AthService,
+class ATLAS_CHECK_THREAD_SAFETY TRT_StrawNeighbourSvc: public AthService,
   virtual public ITRT_StrawNeighbourSvc
 {
  public: