diff --git a/gptc/tokenizer.py b/gptc/tokenizer.py
index fe09223..bf687a2 100644
--- a/gptc/tokenizer.py
+++ b/gptc/tokenizer.py
@@ -17,6 +17,7 @@ def tokenize(
     converted_text: Union[str, List[str]] = text.lower()
 
     if has_emoji and use_emoji:
+        text = text.lower()
         parts = []
         highest_end = 0
         for emoji_part in emoji.emoji_list(text):