diff --git a/fix_tokenizer.py b/fix_tokenizer.py
index 9556ea6..67563c2 100644
--- a/fix_tokenizer.py
+++ b/fix_tokenizer.py
@@ -37,6 +37,8 @@ else:
 # ===== 自动修复策略 =====
 if typ == "fast":
     cfg["tokenizer_class"] = "PreTrainedTokenizerFast"
+    cfg["from_slow"] = False
+    cfg.pop("backend", None)
 
 elif typ == "sentencepiece":
     cfg["tokenizer_class"] = "LlamaTokenizer"
@@ -55,6 +57,7 @@ bad_classes = [
 
 if orig_cls in bad_classes:
     print(f"[fix] override bad tokenizer_class: {orig_cls} → {cfg['tokenizer_class']}")
+    print(f"[fix] override from_slow: {cfg['from_slow']}")
 
 # 修复 extra_special_tokens: list → dict 格式
 if "extra_special_tokens" in cfg and isinstance(cfg["extra_special_tokens"], list):