diff --git a/jstests/exists.js b/jstests/exists.js
index 20c3fe8dbd2..8afaf8e1ac9 100644
--- a/jstests/exists.js
+++ b/jstests/exists.js
@@ -7,6 +7,12 @@ t.save( {a:{b:1}} );
 t.save( {a:{b:{c:1}}} );
 t.save( {a:{b:{c:{d:null}}}} );
 
+assert.eq( 5, t.count() );
+assert.eq( 1, t.count( {a:null} ) );
+assert.eq( 2, t.count( {'a.b':null} ) );
+assert.eq( 3, t.count( {'a.b.c':null} ) );
+assert.eq( 5, t.count( {'a.b.c.d':null} ) );
+
 assert.eq( 5, t.count() );
 assert.eq( 4, t.count( {a:{$ne:null}} ) );
 assert.eq( 3, t.count( {'a.b':{$ne:null}} ) );