diff --git a/DataFormats/Provenance/src/ParentageRegistry.cc b/DataFormats/Provenance/src/ParentageRegistry.cc
index d4a17dfeeba55..f729aca17932c 100644
--- a/DataFormats/Provenance/src/ParentageRegistry.cc
+++ b/DataFormats/Provenance/src/ParentageRegistry.cc
@@ -1,8 +1,9 @@
 #include "DataFormats/Provenance/interface/ParentageRegistry.h"
+#include "FWCore/Utilities/interface/thread_safety_macros.h"
 
 namespace edm {
   ParentageRegistry* ParentageRegistry::instance() {
-    static ParentageRegistry s_reg;
+    CMS_THREAD_SAFE static ParentageRegistry s_reg;
     return &s_reg;
   }
 
@@ -26,4 +27,4 @@ namespace edm {
   bool ParentageRegistry::insertMapped(value_type&& v) { return m_map.emplace(v.id(), std::move(v)).second; }
 
   void ParentageRegistry::clear() { m_map.clear(); }
-}  // namespace edm
\ No newline at end of file
+}  // namespace edm