diff --git a/tractor/_root.py b/tractor/_root.py
index e9c35f7f..51dfc660 100644
--- a/tractor/_root.py
+++ b/tractor/_root.py
@@ -521,7 +521,7 @@ async def open_root_actor(
 
                     op_nested_actor_repr: str = _pformat.nest_from_op(
                         input_op='>) ',
-                        tree_str=actor.pformat(),
+                        text=actor.pformat(),
                         nest_prefix='|_',
                     )
                     logger.info(
diff --git a/tractor/_runtime.py b/tractor/_runtime.py
index 2f9749a2..1d89c63d 100644
--- a/tractor/_runtime.py
+++ b/tractor/_runtime.py
@@ -1698,10 +1698,10 @@ async def async_main(
         )
 
     op_nested_actor_repr: str = _pformat.nest_from_op(
-        input_op=')> ',
-        tree_str=actor.pformat(),
+        input_op=')>',
+        text=actor.pformat(),
         nest_prefix='|_',
-        back_from_op=2,
+        nest_indent=1,  # under >
     )
     teardown_report += (
         'Actor runtime exited\n'