--- a/src/hotspot/share/gc/parallel/pcTasks.hpp	Tue May 29 09:26:00 2018 +0200
+++ b/src/hotspot/share/gc/parallel/pcTasks.hpp	Mon Jun 18 12:11:59 2018 +0200
@@ -140,7 +140,7 @@
 //
 
 class RefProcTaskExecutor: public AbstractRefProcTaskExecutor {
-  virtual void execute(ProcessTask& task);
+  virtual void execute(ProcessTask& task, uint ergo_workers);
 };