--- old/agent/src/share/classes/sun/jvm/hotspot/oops/Instance.java	2012-10-08 20:35:22.332912923 +0200
+++ new/agent/src/share/classes/sun/jvm/hotspot/oops/Instance.java	2012-10-08 20:35:22.143398923 +0200
@@ -53,7 +53,7 @@
 
   // Returns header size in bytes.
   public static long getHeaderSize() {
-    if (VM.getVM().isCompressedHeadersEnabled()) {
+    if (VM.getVM().isCompressedKlassPointersEnabled()) {
       return typeSize - VM.getVM().getIntSize();
     } else {
       return typeSize;