--- old/src/hotspot/share/gc/z/zSafeDelete.inline.hpp	2020-06-17 15:03:22.510824253 +0200
+++ new/src/hotspot/share/gc/z/zSafeDelete.inline.hpp	2020-06-17 15:03:22.322821090 +0200
@@ -39,7 +39,7 @@
 bool ZSafeDeleteImpl<T>::deferred_delete(ItemT* item) {
   ZLocker<ZLock> locker(_lock);
   if (_enabled > 0) {
-    _deferred.add(item);
+    _deferred.append(item);
     return true;
   }