diff --git a/ark_search/recall/bm25.py b/ark_search/recall/bm25.py
index 6d03862..d183287 100644
--- a/ark_search/recall/bm25.py
+++ b/ark_search/recall/bm25.py
@@ -51,6 +51,8 @@ def __init__(
         self.idf = {}
         self.doc_len = []
 
+        self.tokenizer = tokenizer
+
         if is_retain_docs:
             self.docs = copy.deepcopy(corpus)