diff --git a/Control/xAODRootAccess/Root/THolderCache.cxx b/Control/xAODRootAccess/Root/THolderCache.cxx
index a23b37e4bcdc78e01423fe7d424aa4494701c06e..ff957d26b19bc2e5e318f2de3f5730299c15483e 100644
--- a/Control/xAODRootAccess/Root/THolderCache.cxx
+++ b/Control/xAODRootAccess/Root/THolderCache.cxx
@@ -2,6 +2,7 @@
 
 // Local include(s):
 #include "THolderCache.h"
+#include <mutex>
 
 namespace xAOD {
 
diff --git a/Control/xAODRootAccess/xAODRootAccess/tools/TDestructorRegistry.icc b/Control/xAODRootAccess/xAODRootAccess/tools/TDestructorRegistry.icc
index c45fbef9e46b039d89d13878152ac030a7097173..bda6ae89231b75cb9fddf8ab5c27cf3aa47de6a5 100644
--- a/Control/xAODRootAccess/xAODRootAccess/tools/TDestructorRegistry.icc
+++ b/Control/xAODRootAccess/xAODRootAccess/tools/TDestructorRegistry.icc
@@ -7,6 +7,7 @@
 
 // System include(s):
 #include <typeinfo>
+#include <mutex>
 
 // Local include(s):
 #include "xAODRootAccess/tools/TDestructor.h"