diff --git a/config.json b/config.json
index 7178a9c..8af9744 100644
--- a/config.json
+++ b/config.json
@@ -14,6 +14,7 @@
   "num_attention_heads": 12,
   "num_hidden_layers": 12,
   "pad_token_id": 0,
+  "tokenizer_class": "BertJapaneseTokenizer",
   "type_vocab_size": 2,
   "vocab_size": 32000
 }