1 files changed, 8 insertions, 0 deletions
diff --git a/db/namespace.h b/db/namespace.h
index c773e406860..664ec2d166a 100644
--- a/db/namespace.h
+++ b/db/namespace.h
@@ -178,6 +178,14 @@ namespace mongo {
         enum { NIndexesExtra = 30,
                NIndexesBase  = 10
         };
+    public:
+        struct ExtraOld {
+            // note we could use this field for more chaining later, so don't waste it:
+            unsigned long long reserved1;
+            IndexDetails details[NIndexesExtra];
+            unsigned reserved2;
+            unsigned reserved3;
+        };
         class Extra { 
             long _next;
             unsigned long reserved4;