diff --git a/mongoengine/queryset.py b/mongoengine/queryset.py
index e275bb31..6d4ad55e 100644
--- a/mongoengine/queryset.py
+++ b/mongoengine/queryset.py
@@ -479,6 +479,7 @@ class QuerySet(object):
             query &= q_obj
         self._query_obj &= query
         self._mongo_query = None
+        self._cursor_obj = None
         return self
 
     def filter(self, *q_objs, **query):