diff -r 3054503bad7d -r caa25ab47aca src/hotspot/share/jfr/recorder/checkpoint/types/jfrType.hpp
--- a/src/hotspot/share/jfr/recorder/checkpoint/types/jfrType.hpp	Fri Sep 13 16:03:31 2019 -0700
+++ b/src/hotspot/share/jfr/recorder/checkpoint/types/jfrType.hpp	Sat Sep 14 14:40:09 2019 +0200
@@ -108,7 +108,10 @@
 };
 
 class TypeSet : public JfrSerializer {
+ private:
+  JfrCheckpointWriter* _leakp_writer;
  public:
+  explicit TypeSet(JfrCheckpointWriter* leakp_writer = NULL);
   void serialize(JfrCheckpointWriter& writer);
 };