diff --git a/tractor/_exceptions.py b/tractor/_exceptions.py
index d213a20..3d20200 100644
--- a/tractor/_exceptions.py
+++ b/tractor/_exceptions.py
@@ -40,6 +40,7 @@ class InternalActorError(RemoteActorError):
 class TransportClosed(trio.ClosedResourceError):
     "Underlying channel transport was closed prior to use"
 
+
 class ContextCancelled(RemoteActorError):
     "Inter-actor task context cancelled itself on the callee side."