diff --git a/piker/ui/_overlay.py b/piker/ui/_overlay.py
index e22b7a33..7a5f047d 100644
--- a/piker/ui/_overlay.py
+++ b/piker/ui/_overlay.py
@@ -367,8 +367,8 @@ class PlotItemOverlay:
                 if not sub_handlers:
 
                     src_handler = getattr(
-                        root.vb,
-                        ev_name,
+                       root.vb,
+                       ev_name,
                     )
 
                     def broadcast(