--- old/src/hotspot/share/gc/z/zOopClosures.hpp	2020-01-22 10:29:54.591884157 +0100
+++ new/src/hotspot/share/gc/z/zOopClosures.hpp	2020-01-22 10:29:54.071875647 +0100
@@ -31,12 +31,6 @@
 public:
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
-
-#ifdef ASSERT
-  virtual bool should_verify_oops() {
-    return false;
-  }
-#endif
 };
 
 class ZNMethodOopClosure : public OopClosure {
@@ -52,12 +46,6 @@
 
   virtual void do_oop(oop* p);
   virtual void do_oop(narrowOop* p);
-
-#ifdef ASSERT
-  virtual bool should_verify_oops() {
-    return false;
-  }
-#endif
 };
 
 class ZPhantomIsAliveObjectClosure : public BoolObjectClosure {