diff -r e9d804821c48 -r dc7d3b7a918c src/Zone.cpp
--- a/src/Zone.cpp	Wed Aug 01 22:32:59 2012 -0700
+++ b/src/Zone.cpp	Sat Aug 04 17:51:43 2012 -0700
@@ -88,6 +88,8 @@
         return false;
     if ((maps_[MapKind_Native] = allocateMap(MapKind_Native, sizeof(Map))) == NULL)
         return false;
+    if ((maps_[MapKind_Descriptor] = allocateMap(MapKind_Descriptor, sizeof(Map))) == NULL)
+        return false;
     if ((maps_[MapKind_FreeRegion] = allocateMap(MapKind_FreeRegion, sizeof(Map))) == NULL)
         return false;
     if ((maps_[MapKind_EnvironmentSlotDescriptorArray] =