--- a/src/hotspot/share/gc/z/zReferenceProcessor.cpp	Thu Apr 25 05:54:54 2019 -0700
+++ b/src/hotspot/share/gc/z/zReferenceProcessor.cpp	Thu Apr 25 10:56:31 2019 -0400
@@ -450,7 +450,7 @@
 
   {
     // Heap_lock protects external pending list
-    MonitorLockerEx ml(Heap_lock);
+    MonitorLocker ml(Heap_lock);
 
     // Prepend internal pending list to external pending list
     *_pending_list_tail = Universe::swap_reference_pending_list(_pending_list.get());