diff --git a/tracetools_launch/trace.py b/tracetools_launch/trace.py
index 4694bfb..156af97 100644
--- a/tracetools_launch/trace.py
+++ b/tracetools_launch/trace.py
@@ -24,7 +24,8 @@ class Trace(Action):
         base_path: str = '/tmp',
         events_ust: List[str] = names.DEFAULT_EVENTS_ROS,
         events_kernel: List[str] = names.DEFAULT_EVENTS_KERNEL,
-        **kwargs) -> None:
+        **kwargs
+    ) -> None:
         """Constructor."""
         super().__init__(**kwargs)
         self.__session_name = session_name