diff --git a/InnerDetector/InDetValidation/PixelRTT/src/ResPullValidation.cxx b/InnerDetector/InDetValidation/PixelRTT/src/ResPullValidation.cxx
index f3336ebb6b3f89a2543512e18872ad0a06a8b66d..e77b1b47899e1c37f2038c22e453641f864bb44f 100644
--- a/InnerDetector/InDetValidation/PixelRTT/src/ResPullValidation.cxx
+++ b/InnerDetector/InDetValidation/PixelRTT/src/ResPullValidation.cxx
@@ -146,7 +146,7 @@ int ResPullValidation::Read(){
 
 //////////////////////////////////////////////////////////////////////////////////////////
 
-int ResPullValidation::Write ATLAS_NOT_THREAD_SAFE (){ // Thread unsafe MultiHisto<ht>::Write method is used.
+int ResPullValidation::Write(){
 
 	TDirectory *current = gDirectory;
 	TDirectory *globaldir = current->mkdir(m_globaldirname.c_str());
diff --git a/InnerDetector/InDetValidation/PixelRTT/src/TrackValidation.cxx b/InnerDetector/InDetValidation/PixelRTT/src/TrackValidation.cxx
index e44c89561b1be43b5f7a784590cb46fbd3a24b75..589120816c6f47a5e96c584288ec917d071ad4a3 100644
--- a/InnerDetector/InDetValidation/PixelRTT/src/TrackValidation.cxx
+++ b/InnerDetector/InDetValidation/PixelRTT/src/TrackValidation.cxx
@@ -112,7 +112,7 @@ int CosmicTrackValidation::Read(){
 
 //////////////////////////////////////////////////////////////////////////////////////////
 
-int CosmicTrackValidation::Write ATLAS_NOT_THREAD_SAFE (){ // Thread unsafe MultiHisto<ht>::Write method is used.
+int CosmicTrackValidation::Write(){
 
 	TDirectory *current = gDirectory;
 	TDirectory *globaldir = current->mkdir(m_globaldirname.c_str());