diff -r 1ffc0fa0e98b -r 391d671f222b src/hotspot/share/runtime/vmOperations.hpp
--- a/src/hotspot/share/runtime/vmOperations.hpp	Fri Jan 25 10:59:07 2019 +0000
+++ b/src/hotspot/share/runtime/vmOperations.hpp	Wed Jan 23 13:40:09 2019 +0100
@@ -445,7 +445,7 @@
   bool                           _with_locked_monitors;
   bool                           _with_locked_synchronizers;
 
-  ThreadSnapshot* snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl);
+  void snapshot_thread(JavaThread* java_thread, ThreadConcurrentLocks* tcl);
 
  public:
   VM_ThreadDump(ThreadDumpResult* result,