diff --git a/pymilvus/orm/iterator.py b/pymilvus/orm/iterator.py
index 97b348419..709efe500 100644
--- a/pymilvus/orm/iterator.py
+++ b/pymilvus/orm/iterator.py
@@ -504,6 +504,7 @@ def __init__(
             "timeout": timeout,
             "round_decimal": round_decimal,
         }
+        self._collection_name = collection_name
         self._expr = expr
         self.__check_set_params(param)
         self.__check_for_special_index_param()