--- old/src/hotspot/share/gc/z/zBarrierSet.hpp	2019-02-25 16:57:12.507814798 -0500
+++ new/src/hotspot/share/gc/z/zBarrierSet.hpp	2019-02-25 16:57:12.099793286 -0500
@@ -37,8 +37,8 @@
 
   virtual void on_thread_create(Thread* thread);
   virtual void on_thread_destroy(Thread* thread);
-  virtual void on_thread_attach(JavaThread* thread);
-  virtual void on_thread_detach(JavaThread* thread);
+  virtual void on_thread_attach(Thread* thread);
+  virtual void on_thread_detach(Thread* thread);
 
   virtual void print_on(outputStream* st) const {}