diff --git a/server/src/uds/models/transport.py b/server/src/uds/models/transport.py
index a481b515f..0ae1ba1f6 100644
--- a/server/src/uds/models/transport.py
+++ b/server/src/uds/models/transport.py
@@ -150,7 +150,7 @@ class Transport(ManagedObjectModel, TaggingMixin):
         Returns:
             bool: True if this transport is valid for the specified OS, False otherwise
         """
-        return not self.allowed_oss or os.name.lower() in str(self.allowed_oss.lower()).split(',')
+        return not self.allowed_oss or os.name.casefold() in str(self.allowed_oss.casefold()).split(',')
 
     def __str__(self) -> str:
         return f'{self.name} of type {self.data_type} (id:{self.id})'