diff --git a/supervision/dataset/utils.py b/supervision/dataset/utils.py
index 20b80978f..6c30eeab0 100644
--- a/supervision/dataset/utils.py
+++ b/supervision/dataset/utils.py
@@ -55,7 +55,7 @@ def merge_class_lists(class_lists: List[List[str]]) -> List[str]:
 
     for class_list in class_lists:
         for class_name in class_list:
-            unique_classes.add(class_name.lower())
+            unique_classes.add(class_name)
 
     return sorted(list(unique_classes))