protect global undefined_ variable MINOR

1 files changed, 1 insertions, 1 deletions

diff --git a/shell/utils.cpp b/shell/utils.cpp
index 354f9c4ffec..ee876c62ef9 100644
--- a/shell/utils.cpp
+++ b/shell/utils.cpp
@@ -34,7 +34,7 @@ namespace mongo {
             b.appendUndefined( "" );
             return b.obj();
         }
-        BSONObj undefined_ = makeUndefined();
+        const BSONObj undefined_ = makeUndefined();
         
         BSONObj encapsulate( const BSONObj &obj ) {
             return BSON( "" << obj );