diff --git a/micronlp/tokenizer.py b/micronlp/tokenizer.py
index e373763..c33a294 100644
--- a/micronlp/tokenizer.py
+++ b/micronlp/tokenizer.py
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 import unicodedata
-from typing import List, Iterator, Iterable
+from typing import Iterator, Iterable
 import emoji
 
 
@@ -46,7 +46,7 @@ def tokenize(
         yield last_token
 
 
-def ngrams(tokens: Iterable[str], max_ngram_length: int) -> List[str]:
+def ngrams(tokens: Iterable[str], max_ngram_length: int) -> Iterable[str]:
     if max_ngram_length == 1:
         return tokens