--- old/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZExternalBitMap.java	2019-02-13 16:35:03.418271320 +0100
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZExternalBitMap.java	2019-02-13 16:35:03.034271333 +0100
@@ -23,7 +23,7 @@
             throw new RuntimeException("Not a Z offset: " + zOffset);
         }
 
-        ZPage page = pageTable.get(ZOop.to_address(zOffset));
+        ZPage page = pageTable.get(ZUtils.longToAddress(zOffset));
         if (page == null) {
             throw new RuntimeException("Address not in pageTable: " + zOffset);
         }