diff --git a/launch_ros/launch_ros/actions/load_composable_nodes.py b/launch_ros/launch_ros/actions/load_composable_nodes.py
index fda356a2..6ab36f7f 100644
--- a/launch_ros/launch_ros/actions/load_composable_nodes.py
+++ b/launch_ros/launch_ros/actions/load_composable_nodes.py
@@ -85,7 +85,7 @@ def __init__(
         super().__init__(**kwargs)
         self.__composable_node_descriptions = composable_node_descriptions
         self.__target_container = target_container
-        self.__final_target_container_name = None  # type: Optional[Text]
+        self.__final_target_container_name: Optional[Text] = None
         self.__logger = launch.logging.get_logger(__name__)
 
     @classmethod
diff --git a/launch_ros/launch_ros/utilities/evaluate_parameters.py b/launch_ros/launch_ros/utilities/evaluate_parameters.py
index 467bf709..693c3a9b 100644
--- a/launch_ros/launch_ros/utilities/evaluate_parameters.py
+++ b/launch_ros/launch_ros/utilities/evaluate_parameters.py
@@ -157,7 +157,7 @@ def evaluate_parameters(context: LaunchContext, parameters: Parameters) -> Evalu
     :param parameters: normalized parameters
     :returns: values after evaluating lists of substitutions
     """
-    output_params = []  # type: List[Union[pathlib.Path, Dict[str, EvaluatedParameterValue]]]
+    output_params: List[Union[pathlib.Path, Dict[str, EvaluatedParameterValue]]] = []
     for param in parameters:
         if isinstance(param, ParameterFile):
             # Evaluate a list of Substitution to a file path