diff --git a/piker/fsp/_engine.py b/piker/fsp/_engine.py
index 5d389e29..c47455e3 100644
--- a/piker/fsp/_engine.py
+++ b/piker/fsp/_engine.py
@@ -36,6 +36,7 @@ from .. import data
 from ..data import attach_shm_array
 from ..data.feed import (
     Flume,
+    Feed,
 )
 from ..data._sharedmem import ShmArray
 from ..data._sampling import _default_delay_s
@@ -302,6 +303,7 @@ async def cascade(
         raise ValueError(f'Unknown fsp target: {ns_path}')
 
     # open a data feed stream with requested broker
+    feed: Feed
     async with data.feed.maybe_open_feed(
         [fqsn],
 
diff --git a/piker/ui/_fsp.py b/piker/ui/_fsp.py
index dfbd8b9a..9e05f545 100644
--- a/piker/ui/_fsp.py
+++ b/piker/ui/_fsp.py
@@ -51,7 +51,10 @@ from ._forms import (
     mk_form,
     open_form_input_handling,
 )
-from ..fsp._api import maybe_mk_fsp_shm, Fsp
+from ..fsp._api import (
+    maybe_mk_fsp_shm,
+    Fsp,
+)
 from ..fsp import cascade
 from ..fsp._volume import (
     # tina_vwap,