--- a/src/hotspot/share/runtime/perfData.hpp	Thu Nov 30 16:08:13 2017 +0100
+++ b/src/hotspot/share/runtime/perfData.hpp	Thu Nov 30 21:24:52 2017 +0530
@@ -245,6 +245,7 @@
 
   friend class StatSampler;      // for access to protected void sample()
   friend class PerfDataManager;  // for access to protected destructor
+  friend class VMStructs;
 
   public: