--- old/src/share/vm/gc_implementation/g1/vm_operations_g1.cpp	2015-02-06 12:38:23.088219388 +0100
+++ new/src/share/vm/gc_implementation/g1/vm_operations_g1.cpp	2015-02-06 12:38:23.004222307 +0100
@@ -38,7 +38,7 @@
                                                      size_t word_size)
   : VM_G1OperationWithAllocRequest(gc_count_before, word_size,
                                    GCCause::_allocation_failure) {
-  guarantee(word_size > 0, "an allocation should always be requested");
+  guarantee(word_size != 0, "An allocation should always be requested with this operation.");
 }
 
 void VM_G1CollectForAllocation::doit() {