--- old/src/hotspot/share/gc/shared/gcArguments.hpp	2017-11-29 12:36:34.392848478 +0100
+++ new/src/hotspot/share/gc/shared/gcArguments.hpp	2017-11-29 12:36:34.144838624 +0100
@@ -49,7 +49,7 @@
   void post_heap_initialize();
 
   virtual void initialize_flags();
-  virtual void parse_verification_type(const char* type);
+  virtual bool parse_verification_type(const char* type);
 
   virtual size_t conservative_max_heap_alignment() = 0;