diff --git a/unsloth/tokenizer_utils.py b/unsloth/tokenizer_utils.py
index 7b88b0932f..07cd874125 100644
--- a/unsloth/tokenizer_utils.py
+++ b/unsloth/tokenizer_utils.py
@@ -41,14 +41,17 @@ IGNORED_TOKENIZER_CHECKING = frozenset((
 ))
 
 
-IGNORED_TOKENIZER_NAMES = frozenset((
+IGNORED_TOKENIZER_NAMES = [
     "unsloth/Mistral-Nemo-Instruct-2407-bnb-4bit",
     "unsloth/Mistral-Nemo-Instruct-2407",
     "mistralai/Mistral-Nemo-Instruct-2407",
     "unsloth/Mistral-Nemo-Base-2407-bnb-4bit",
     "unsloth/Mistral-Nemo-Base-2407",
     "mistralai/Mistral-Nemo-Base-2407",
-))
+]
+IGNORED_TOKENIZER_NAMES = frozenset(
+    [x.lower() for x in IGNORED_TOKENIZER_NAMES]
+)
 
 # Check environments
 keynames = "\n" + "\n".join(os.environ.keys())