diff --git a/mongoengine/queryset/transform.py b/mongoengine/queryset/transform.py
index e575d9d6..83bd9f8e 100644
--- a/mongoengine/queryset/transform.py
+++ b/mongoengine/queryset/transform.py
@@ -160,7 +160,7 @@ def query(_doc_cls=None, _field_operation=False, **query):
         if isinstance(v, list):
             value = [{k: val} for val in v]
             if '$and' in mongo_query.keys():
-                mongo_query['$and'].append(value)
+                mongo_query['$and'].extend(value)
             else:
                 mongo_query['$and'] = value