diff --git a/tractor/_spawn.py b/tractor/_spawn.py
index 3f07ba0..cb1f3b2 100644
--- a/tractor/_spawn.py
+++ b/tractor/_spawn.py
@@ -357,7 +357,7 @@ async def mp_new_proc(
         else:
             fs_info = (None, None, None, None, None)
 
-        proc = _ctx.Process(  # type: ignore
+        proc: mp.Process = _ctx.Process(  # type: ignore
             target=_mp_main,
             args=(
                 subactor,