diff --git a/clip/clip.py b/clip/clip.py
index 257511e1d..535219421 100644
--- a/clip/clip.py
+++ b/clip/clip.py
@@ -2,7 +2,7 @@
 import os
 import urllib
 import warnings
-from typing import Any, Union, List
+from typing import Any, Union, List, Sequence
 from pkg_resources import packaging
 
 import torch
@@ -194,7 +194,7 @@ def patch_float(module):
     return model, _transform(model.input_resolution.item())
 
 
-def tokenize(texts: Union[str, List[str]], context_length: int = 77, truncate: bool = False) -> Union[torch.IntTensor, torch.LongTensor]:
+def tokenize(texts: Union[str, Sequence[str]], context_length: int = 77, truncate: bool = False) -> Union[torch.IntTensor, torch.LongTensor]:
     """
     Returns the tokenized representation of given input string(s)