diff -r 9c2ecc2ffb12 -r 1fdb98a17101 src/share/vm/runtime/arguments.cpp
--- a/src/share/vm/runtime/arguments.cpp	Fri Jul 11 01:14:44 2008 -0700
+++ b/src/share/vm/runtime/arguments.cpp	Sat Jul 19 17:38:22 2008 -0400
@@ -1176,9 +1176,7 @@
   // by ergonomics.
   if (MaxHeapSize <= max_heap_for_compressed_oops()) {
     if (FLAG_IS_DEFAULT(UseCompressedOops)) {
-      // Leave compressed oops off by default. Uncomment
-      // the following line to return it to default status.
-      // FLAG_SET_ERGO(bool, UseCompressedOops, true);
+      FLAG_SET_ERGO(bool, UseCompressedOops, true);
     }
   } else {
     if (UseCompressedOops && !FLAG_IS_DEFAULT(UseCompressedOops)) {