diff -r d275c3dc73e6 -r ca0a78017dc7 src/share/vm/memory/tenuredGeneration.cpp
--- a/src/share/vm/memory/tenuredGeneration.cpp	Thu Jan 03 16:28:22 2013 -0800
+++ b/src/share/vm/memory/tenuredGeneration.cpp	Sun Dec 30 08:47:52 2012 +0100
@@ -62,7 +62,7 @@
                                        _virtual_space.reserved_size(),
                                        _the_space, _gen_counters);
 #ifndef SERIALGC
-  if (UseParNewGC && ParallelGCThreads > 0) {
+  if (UseParNewGC) {
     typedef ParGCAllocBufferWithBOT* ParGCAllocBufferWithBOTPtr;
     _alloc_buffers = NEW_C_HEAP_ARRAY(ParGCAllocBufferWithBOTPtr,
                                       ParallelGCThreads, mtGC);