diff --git a/app/api/__init__.py b/app/api/__init__.py
index 821f029..20ca112 100644
--- a/app/api/__init__.py
+++ b/app/api/__init__.py
@@ -72,7 +72,7 @@ def validate_marker(marker_str: str) -> int:
         abort(400, description="Marker must be a valid token.")
 
 
-TLPMarkings = Union[  # pylint: disable=invalid-name
+TlpMarkings = Union[
     Literal["default"],
     Literal["clear"],
     Literal["green"],
@@ -86,13 +86,13 @@ def list_resources(  # pylint: disable=too-many-arguments,too-many-locals
         model: Type[Any],
         serialize_func: Callable[[Any], Dict[str, Any]],
         *,
-        filters: List[ListFilter] = [],
+        filters: List[ListFilter] = None,
         order_by: Optional[ColumnElement[Any]] = None,
         resource_name: str = 'ResourceList',
         max_items_param: str = 'MaxItems',
         marker_param: str = 'Marker',
         max_allowed_items: int = 100,
-        protective_marking: TLPMarkings = 'default',
+        protective_marking: TlpMarkings = 'default',
 ) -> ResponseReturnValue:
     try:
         marker = request.args.get(marker_param)