diff --git a/python/dolma/cli/tokenizer.py b/python/dolma/cli/tokenizer.py
index 2f86a3bf..2e21a9bc 100644
--- a/python/dolma/cli/tokenizer.py
+++ b/python/dolma/cli/tokenizer.py
@@ -51,7 +51,7 @@ class TokenizerConfig:
         help="Whether to encode special tokens in the tokenized output, e.g. splitting '<s>' into '<', 's', '>'.",
     )
 
-    def __post__init__(self):
+    def __post_init__(self):
         logger = get_logger(__file__)
 
         if self.eos_token_id is None: